Basically, Bismark spent his life unifying Germany, had a strong policy about not expanding its borders with unnecessary war, despite his Brash attitude towards everyone. Wilhelm and his desire to "grow his empire" basically lead to World War I, and ultimately is early departure as the leader of "Germany" because of the very things that Bismark was against?
Or was he full of himself and cared nothing at all for Bismark until the very end thinking he was a great ruler with no regret? Despite losing respect from all his military leaders as well as the rest of military and people.
I can only speak briefly at the moment but it is worth noting that Germany was not an absolute monarchy. Willy was not an independent actor sending Germany on a death spiral on his own accord.
Weltpolitik is a collaborative creation that is as much Tipitz, Bulow, and Bethmann-Hollweg as it is Willhelm II. It would be incorrect to have this discussion under the pretense that Willy was somehow acting against the interests of the majority of the German government and that the major decision makers did not share his aspirations. That includes the 'military people.'
As for his personal beliefs on Bismark I do not know as in haven't read a biography on the man wholly yet. I just feel that that this discussion needed the context as it seems as if you have a misconception in that regard.