Well regardless, you are going to have to wait a year at the minimum before pursuing any treatments since you only recently completed Accutane. I've done accutane myself, and while it completely cured my severe acne, it has definitely affected my healing abilities following several procedures.
Which laser does this derm use? Remember that derms are running a business, and oftentimes recommend the laser they have in their office. They're trying to recoup the cost of a laser which is easily more than $100K. There are folks here who have done much more aggressive treatments and are lucky if they got anything near 50% improvement, which makes your derm's claim a little far fetched.