They are all a good height, and the lift attendants are very helpful. The terrain is great unless you are a die hard double diamond skier. Most of the mountain trails are big wide blue and black cruisers, and long winding greens. I had a great time at Okemo. The access is good.
Handicapped parking is in the upper parking lot.
There is a push to ticket sales, and between the main lodge and ticket sales there is a bit of a hill to push up. It can be difficult if covered with snow. You can go under the main lodge just behind the handicapped parking and access the deck to the right, but watch out for the ski racks, they might be in your way. Once you are near the deck you can set up your mono, the snow and lifts are right there. I thought it was very cramped.