I completely empathize, and I am really short- just five foot. However I won't get annoyed if seated behind a tall person- I tend to just swap seats with a taller member of my family.
Since I'm only fifteen, I find this challenging at school when I am seated right at the back at the classroom behind many, many tall people. Teachers in the past have made a fuss of moving me to the front, or anywhere with a better view, even when they are aware I cannot see the whiteboard or what they are teaching us a lot of the time. I don't want to compromise my learning, and that's a non Disney related pet peeve.
Another one I did not really encounter in WDW but in the Scottish highlands. We were on a funicular railway, which is basically like a tilted bus going up the hill. There were rows of seating, each with a very good view, although the front row is the best by a little. We arrived half an hour early to get the front row and waited in the cold. 25 minutes later the train was half full, and good seats still available at the back half. However some large people walked right up into our section and stood right infront of us- no seats left, but they decided they wanted a good view and they obviously didn't mind blocking ours, and other families' views. Ontop of this, their thighs were about an inch away from my face. When we politely asked them to shuffle forward a bit they just glared and looked away. They had blocked the views of the first two rows of people all of whom were annoyed. And this conversation went on between the mother and father:
'I think people are annoyed that we are blocking their views- should we move to another row- look- there are some good seats back there.'
'No, I don't care what they think or if I'm blocking their view, I'm happy here and I don't want to give them the satisfaction of leaving.'
I wouldn't have minded at all if all the seats were full but when half the trains seats were empty and they showed disregard for other passengers- it really annoyed me