Hey Brewsum,
I agree that the buildings are quite large and require quite a bit of running around. It's a time sink, pure and simple.
You'll get the option to ride a speeder at level 25, which helps a lot, but it's quite a money sink. The riding skill itself is 35,000 credits and if you didn't get a free speeder with a digital deluxe or collectors edition then you'll have to shell 10s of thousands to purchase a speeder from the vendor.
The huge buildings do seem to be consistent with the lore presented in the Old Republic comics and games though.