I dont think there is a lack of content after 20...but the size of the areas getting bigger n all = more running around.
Also the zones arent quite as open as Id hoped, but maybe Im still in fairly newby areas. Its also a little more confusing as to travel and where to go I find
Bag space Im not too fussed about considering with WoW you used to start with like 12 slots as opposed to twenty something?
The banks will be working at some point I think?