You do have to take care to align the disc with the calipers, but you don't have to adjust the brake itself at all to fit the tire past the brake, like you would with a rim brake. The hardest thing I've found so far is that you can't rest the bike on the front fork (if you're doing a front change) since the disc brake is the lowest part once the front wheel is out.
Yours must be set up differently to mine. I always rest the bike on the front fork - the dropouts are the lowest part for me and the brake calipers are further up.