Garrisons are much more in keeping with the Warcraft tradition, IMO. I think I'd much rather place buildings in a garrison than furniture in a house, at least for this game.
The only thing I really want them to do is incorporate more variety in building styles, and perhaps allow for additional decorating with doodads. Perhaps as the expansion carries on, and if the idea persists into future expansions, they can expand it more.
- - - Updated - - -
A name for your garrison, and a customizable sigil, with banners, tabards, and a unique reputation faction for your followers would be pretty awesome.