If walking is so important to you, why not take a half-hour walk...
outside. At least you'll have the benefit of the exercise. And if you don't have to walk a half-hour in the MMO you play every session, that's more time to get out more.
There are more important things in life than being immersed in tedium in the game. I mean, your character also doesn't have to eat, drink, sleep, perform daily hygene, pay taxes, and throw out the garbage for a reason. People just want to cut to the action, not live out yet another boring life.