Last June I dove 5 days with Deep Blue on several different "fast boats". Most were 6 packs or slightly larger. As I recall, all had ladders on the sides, and they pivoted in and out of the water. Ladder folds into boat for travel, flops over the side for diver recovery.
The one word of caution is that you need to hang onto the hand-rail on the boat (usually on one side or the other of the ladder, usually part of one of the the roof supports) when you climb into the boat. (You just need to listen the instructions the DMs give you.) I made the mistake (once) of holding on to the ladder only and I did a magnificent faceplant (or actually mask-plant) on the bottom of the boat. Imagine me pinned to the bottom of the boat, mask flush with the bottom, legs up over the top rung of the ladder, tank and valve at the back of my head. My training took over, and I laid there for a second assessing how to extricate myself. Meanwhile the DM freaked thinking that I must be horribly injured because I was laying there motionless for a moment. What a sight it must have been.
As long as you pay attention, do as you are instructed, and don't do anything stupid, it all works just fine. Gee, that sounds like most other aspects of diving and life.
Learn from someone else's mistakes; it is much less painful that way.
Just my dos centavos for your eductaion and amusement. (definitely don't try this at home)
Wristshot