Yes, it's good to try everything because everyone making these recommendations has different tastes.
For instance, Country Bear Jamboree is one of my favorite attractions at WDW, and I can't stand Monsters Inc Laugh Floor...
If you do try MILF, be forewarned that they make fun of audience members on a video screen before and during the show, despite no warning sign outside the attraction that your "image or likeness may be used without your consent" during the show. I'm glad this didn't happen to me the one time I sat through it. I think if you sit in the very back and way off to the side, this is probably less likely to happen to you, but I don't know this for sure.
I highly reccomend Mickey's Philharmagic!
I also reccomend Carousel of Progress, and even though IMO the Under New Management version of the Tiki Room is not as good as the original, it has its charms and it's best to check it out to form your own opinion rather than listening to others.
These are all continuously-cycling shows. The MK does not have any real major, scheduled-time, live shows except the "Dream Along With Mickey" castle show, which I enjoy other than the lack of shade from which to view the show, which is especially brutal on a hot day.
While usually not considered "shows", I would put the Main Street Electrical Parade and the Wishes fireworks show on the DO NOT MISS list!