Opinions varied, of course, so it's hard to speak of a monolithic attitude here. However, the opinion of those Irish citizens who remained in Ireland towards their departing brethren can best be demonstrated by the peculiar phenomenon known as the "American wake," a party held the night before someone boarded a ship for America. The event was so named because it was nearly certain that emigrants would never see their friends and family again—thus, it was essentially perceived as a form of death. This website provides a decent summary:

If a family could raise only enough money for one passage, the ticket would be bought in the name of the eldest son or daughter. When that son or daughter arrived in America and got a job, money would be sent back to Ireland to help the family pay the rent and eventually to buy another passage for a younger brother or sister. This system of “one bringing another” would follow until the children of an entire family were reunited in America. The days before going put a terrible strain on the parents and the person leaving the parents knew they would never see their oldest son again.

Short stories are a useful window into the way that people felt at a time of emigration; the two I will provide here do not take place during the famine years, but can be seen as (a) resulting from the catastrophic population loss that Ireland continued to experience for many decades after the famine, (b) similar in some regards to narratives of famine-era American wakes. The excellent short story "Going into Exile", from Irish writer Liam O'Flaherty, is a wrenching account of all the complicated emotions evoked by an American wake. Máirtin Ó Cadhain's short story "The Year 1912," quoted in this article on the memory of the famine, is similarly illustrative of the emotions felt during a loved one's departure to America. The "death" of going to America was in some sense even more heartbreaking than a normal death, because it had the same effect without any of the comforting rituals being carried out:

That American coat, the graveclothes—how tell one from the other? The "God speed her" that would be said from now on had for its undermeaning "God have mercy on her soul." Children often got those two expressions mixed up. And when the time came that in actual fact would change the "God speed" into the "God have mercy," it would come without a decent laying-out and without a bier to be carried, and with no passionate keen. [...] The voyage—that immensity, cold and sterile—would erase the name from the genealogy of the race.

Thomas Gallagher, in his book Paddy's Lament, Ireland 1846-1847: Prelude to Hatred (quoted here), notes that "if departure was a kind of death, so was being left with the conviction that your country and way of life were finished. [...] The evening gradually became cathartic for everyone except the intending emigrant."

Aside from the family members of a particular departing emigrant, were those left behind resentful and envious? Perhaps. But such experiences were so pervasive, especially in the impoverished Gaeltacht (Irish-speaking western counties), that most people were likely to have experienced a similar rupture within their own families.

For a book that (somewhat) specifically addresses this question, see Cathal Pórtéir's Famine Echoes.

The writings of WS Trench on the land clearences give a good feel for what happened next.

http://www.rootsweb.ancestry.com/%7Eirlker/lansdowne.html

Emigration wasn't always voluntary but the only alternative to death.

Many Irish officials and "aid workers" appealed to the Duke of Wellington who was born in Ireland to intervene politically to change government policy on the famine. Their letters were often published in the press and are a good source of actual conditions.

http://www.libraryireland.com/articles/MaguireIrishAmerica8/

http://www.movinghere.org.uk/galleries/histories/irish/origins/skibbereen_1.htm#

Famine emigration was something different. These were the poorest and were often part of land clearance initiatives.

Literally, huge numbers either starved, died of disease or emigrated .So it was the poorest and an alternative to death.

Nether were the ships often dubbed coffin ships or the emigrants themselves in good shape.

So it gets dubbed an exodus for obvious reasons .