MK: Always skip, Barnstormer, Speedway (just the smell of the exhaust makes me sick over there), Teacups, Stitch's Great crappy ride, Enchanted Tales with Belle, and the character meet and greets. Tom Sawyer, Country Bears, flying Carpets, Tiki and the shocker, Haunted Mansion, don't know why never really liked the ride. Every once in a while I will ride: Carousel of Progress, Little Mermaid, Winnie the Pooh. If I am not too tired I will run up and down through Swiss Family.
AK: Skip Rafiki's, Bugs Life, Birds show, everything but Dinosaur in that area. I do love walking the paths to view the animals, but often I am too excited to do as many rounds on Everest in the single rider line as possible before I start to feel sick. I never skip Finding Nemo, that show gets me every time.
HS: Don't skip anything but Disney Junior, but do sometimes skip, The Great Movie Ride, Indiana Jones, Frozen show and Beauty and the Beast. Also I will skip Fantasmic if I am there off season as they really cut down the characters, or least the last few times I went it seemed that they did.
Epcot: I skip Journey into the Imagination, Innovations East and West, Ellen's Adventure and all of the movies at the pavilions.
I have been about a dozen or so times by myself and truthfully I don't skip anything because I am by myself, instead I don't ride things I don't want to or are better experienced with one of my nieces. Somehow Dumbo just isn't as magical without my niece by my side.