I love this trend! I think it's new and dynamic, makes great use of page space, and sets webcomics apart from print comics.
but i dont use it, and probably never will, for two reasons. firstly, i dont have the software or knowhow or patience to make gifs. secondly, i'm still aiming to have my comic in print at some point, esp to sell at comicon. i worry that having smth like a gif that wont transition to certain formats could cause a lot of problems down the line.