I wouldn't say that it's kitsch-y - of course it does have some aspects of that - but they've done a fairly good job at making it educational and fun. Some of it is a bit 'dated' (the movies in Norway and France for example), but they're still entertaining. What time of year are you going to be there?
Future world has had some new things added - especially in the Innoventions pavilions - one is a design your own coaster ride along with some other fun stuff.
Depending on when you go, one of the annual festivals may be going on as well. Food and Wine is in the fall (Lots of extra food and alcohol) - and Flower and Garden is in the spring. (Lots of topiary and plants)
WRT fireworks - make sure you try to catch Wishes at Magic Kigndom - out of the two, that one never fails to make me weepy - it's more the 'little girl, wishes, magic' kind of show - while IllumiNations is more a powerful and moving art piece - with explosions