I must have been living in a different universe ... nearly every electrician I've ever met has confided their 'extreme dislike' of heights.
Nor is it always logical. Personally, I really dislike ladders. The guy I trained under simply hated scissor and boom lifts. Oddly enough, he was confident on a ladder, and I was secure in a cherry-picker.
These days, there's a lot of hype about "SEAL Team 6." Well, the founder of SEAL Team 6 (R. Marcinko) and his mentor (R. Boehm, the father of the SEALs), put it this way: you don't have to like it, you just have to do it!
Still, there's something to be said for having a multitude of ladders and accessories. It's amazing how a tiny wobble makes such an impression on you. I have two 'unusual' ladders that are simply rock-solid in certain circumstances, and they're not all that different from the 'usual' ladder. Likewise, there's a lot less 'bounce' in a Type I-A ladder than a Type-II.
There's also something to be said about "tolerance." As in: if I haven't been up a ladder for some time, I am a lot more nervous than I am after a couple days of constant work at height.