I understand the gear. I carry that when cave diving, plus tow scooter at times. What I dont get is strapping all that on, standing up, and walking with it. Even in my younger wreck diving days, the idea of walking around on a rolling boat wearing twins, 2 stages and carrying a scooter never entered my mind, neither did doing a 2 hour 230' dive, decompressing, then climbing up a ladder with it all on. If you are trying that, it will not make you feel younger, particularly your knees, hips back and shoulders as you try to schlep all this junk around.
When kitting up on a dive boat that's moving around on the sea, I prefer to sit down and clip everything on so I can run through my checks before jumping off -- bailouts, SMB reel, fins, etc.
Standing up isn't the problem as the bench, certainly on the dive boats I dive off of, tend to be higher so it's slide off into the standing position then reach out for the side rail and waddle sideways -- like a crab. Doesn't stress my knees as they're kept pretty straight.
The kit is heavy of course but you're not lifting anything as it's all on your back via the harness. Now everything's ready for the jump. Waddle over to the dive lift holding on to the siderails, squeeze into the dive lift and hold on. Run the quick pre-jump check (drysuit dump open, drysuit inflate, wing inflate, quick dil inject, long O2 inject, check PPO2 -- literally takes 5 seconds max). If with a scooter make sure the handle's not caught around the diver lift. When hooter goes, step off and swim to the shot line; dump the wing and down you go.
If it's quite rough then there may be others who can help you from the bench to the dive lift.
On returning to the boat, it's up in the lift/elevator and hopefully people will help remove your stages and fins. If not you perch down to take the weight off your back.
This picture might indicate there's something missing... only three divers on the boat that day; also very calm in the Channel. The dive lift's at the back left with the gate in place.
Different boat, similar layout... Diver on the lift about to jump.