Until 1935, Turkey actually celebrated the 24th of July as a national holiday. Only then the Republican government decided at this stage it was pretty pointless to celebrate it and decided not to anymore. But, even in Turkey, it is fair to say that the celebrations of the 24th of July became less important after the proclamation of the Republic on the 29th of October, 1923. Therefore, you are right, both about the phenomena (to the extent that I know about other ex-Ottoman countries, at least) and the reasons behind it. In what follows, I will try to provide additional detail. As the reasons for why there is no such a holiday in modern-day Armenia are obvious, I will only mention Armenians in passing.

Let us consider Turkey first. There are a variety of reasons why the new Turkey of Kemalists would not think of the Young Turk Revolution as very important. None of this related to the perceived nationalism of the CUP (Committee of Union and Progress), however. In fact, Kemalists always regarded the figures in the CUP on an individual basis. Talat Pasha and Cemal Pasha, for instance, were always regarded rather highly. Not as national heroes, but still, as well-meaning nationalists who did their best to save their country, albeit committing mistakes here and there. This compares starkly with the treatment of Enver Pasha, whom they generally saw as leading the Empire and Turks to an apocalypse due to his pro-German sympathies and imperial goals. More importantly, the view of Kemalists on both the preceding Tanzimat period and the Young Turk Revolution is that though there were some Westernisers and Turkish nationalists in these eras, they remained too wedded to Ottomanism (the unity of all Ottoman citizens regardless of their ethnicity or religion) and/or conservative reformism. Therefore, once you have the Republic, there is not much of a point in celebrating these. For Kemalists, these were already surpassed and could at best be seen as partial, sometimes hesitant but positive steps towards an end only to be fulfilled under them.

The views of Muslim non-Turkish peoples of the Empire, especially their intellectuals and elites differed sharply from what Kemalists thought. Whereas Kemalists believed that the Young Turks were never truly Turkish nationalists (to some extent they were correct, especially before the WW1), minorities believed the CUP to be a secular and Turkish nationalist (and, occasionally, freemason) conspiratory group. Even secular Arab intellectuals mostly (but not always!) tended to see Islam (and the Caliph) as an important link keeping the Empire together before the WW1. The CUP believed it to be enforcing the Turkish language in schools to ensure all imperial citizens were able to spoke Turkish; if an Ottoman identity was to be created that was necessary. Arabs and Albanians (and some Kurds) perceived this to be pure and simple Turkification and assimilation. If you consider the national foundations of these countries, regardless of their current relations with Turkey (in the case of Arabs not particularly stellar today anyhow...), they tended to define themselves against 'the Turkish yoke'. Therefore, no national holiday on the 24th of July for them, as far as I know.

Finally, for the Balkan nations who were not Muslims, they already broke off with the Balkan Wars (1912-13) from the Empire. Even before that, they tended to have their other in the Turk and the Ottoman Empire not to mention the fact that in all cases, nationalist movements predated the emergence of their nation-states. Granted, there was a degree of euphoria in 1908. It was hoped (and also believed by the Young Turks themselves) that the revolution would put an end to the maltreatment of Christians and unite the Empire under the Ottoman identity. Suffice it to say that the mutual distrust and political circumstances, and crucially the impact of these on the way Turks and others saw themselves, were such that the revolution of 1908 was too little too late. It was not able to stop the Balkan Wars, it was not even able to prevent massacres of Armenians in Adana in 1909 (despite Cemal Pasha swiftly arriving to the scene and proceeding to hang the Muslim perpetrators), or even massacres of Muslims in Adana and elsewhere. Once the Balkan Christians and Armenians had their own states, they perceived themselves to be creating modern, national regimes which did not owe to anything to the Young Turks or to the Ottoman Empire at large. But it is important to underline that the events of the WW1 did not cause this barring from Armenians (if at all, since the 'Armenian question', as was called, of the Empire began much before then as well). Already in the Balkan Wars, they had enough reason to distance themselves completely from all things Ottoman.

I hope this helps!