The problem with 2.5 sec GCD is that it feels like it's designed for an 80 year old.. Yet, the game expects you to move around like a teenager at times.

So when I'm in combat, I'm basically moving around, stutter stepping like a mad man but I can't cast any skills so I'm auto attacking half the time

I keep myself entertained by going in circles around every mob I fight, doing mini jumping puzzles while fighting etc...