Jfarbes, most (if not all) the divemasters on AC are accommodating. If you have not had a dive since 98' and want to do a deep dive at the Blue Hole, they may very well request a refresher course. In some cases (as Pedro2 pointed out), they may try you out someplace safe first to monitor your diving abilities.
Most of the dives around the reef range from 30' to 65'. The divemasters are well experienced and will recognize if a diver is having problems.
I have had friends take the refresher courses along the reef (like Hol Chan and Shark Ray Alley) and loved it. At the same time that they were working on their dive skills, they were getting in good dives with awesome scenery and seeing cool fish/sharks.
If you have dived before, skip the pool and refresh in the sea.