Getting in and out of these kayaks from a ladder or whatever takes some practice and a bit of grace (and upper body strength).. The key is keeping your weight centered in the boat as you manoeuver yourself in or out.
Using the lower (in water) ladder rung is very helpful and that's the technique my wife uses, as she hasn't got great balance. I'm quite able to get into and out of the kayaks feet dry, and can drop into the kayak from deck level without taking a swim. But it takes some practice.
We use the two-person inflatable kayak that West Marine sells (can't think of the name of it). We love it - easy to handle, tracks well in a cross-breeze, deflates into a suitcase and takes all of 5 minutes to inflate and launch.
Those inflatable kayaks definitely have their place - esp when the "mothership" is too small to host a rigid kayak on deck. But if you get an opportunity to go for a vigorous paddle with a group with hard kayaks, you'll notice the difference in effort and comfort between the two.
The other advantage you lose is the "oyster proofness' of the plastic boats.. it's one of the main reasons we like our kayaks so much, we don't worry about holing the inflatable on the beach (Oysters, Barnies, sharp rocks etc)