Its still just poker, so its not like, playing a final table is a completely different discipline. There are payjumps between each position though, so you need to consider ICM in every decision, you make. Sometimes its very important, if somebody is running on fumes. Other times not so much, if everyone have similar stacks.
As more players are eliminated, play gets shorthanded, which mean, you have to get involved more often with a wider range of hands. Finally it becomes heads up, and this is a very different game. Now there is no ICM, and SB have position on BB. This mean, SB need to play nearly every hand, and of course it becomes very much a psycological warfare, because you have to beat this one player, and nobody else are involved in the action.