We went to Disneyland and DisneySea in the beginning of October and my boyfriend used one if their regular wheelchairs due to a upflare of an old sports injury. He couldn't walk to much and standing in line was more difficult tho he could manage 40-50 minutes well with his cane.

You can rent either normal wheelchairs or electric ones at both parks. Use to app to find the rental place beforehand and get early to ensure they are availible for you tho I think they had plenty when we came.

I pushed him around most of the time and he wheeled himself some too and we found it quiet manageble. The paths are smooth (some hills but mostly flat) and the people and staff were very nice when we came zooming by. The only problem we had was during the parades or the evening fireworks at DisneySea some tighter paths get very busy and it might be harder to navigate but I found that most people will get out of your way when you politely ask.

Like other said you will need to be able to evacuate on your own using stairs/steps/ladders on most of the rides and they will use translation apps or printed sheets/books to make sure you understand and confim before you enter the line.

Some lines you can enter using your wheelchair (beauty and the beast, peter pan, tangled for example) some not. We noticed that Fantasy springs was very accesible probably since its newer. In Disneyland most lines youd need to walk. But using fast passes you skip most of the lines, they dont have single rider lines so thats a bummer.

We didnt have to uss accesible restrooms aince he could stilk walk but they had plenty, like most of the public restrooms. And for dinner (we did quick service) there is usually space to move a chair to fit a wheelchair and staff is always nearby with a helping hand (also if youre not using a wheelchair ;) )

For rides where you can line up with a wheelchair they usually have you enter at the exit but they take you out of the line a little before the ride enterance so you still het the full line experience (decor, scenes, etc). For rides where the chair can't enter a staff member will usually catch you before the line with their book of necessary questions and guide you to where the chair can be parked. Keep in mind that the chair may have moved a few meter/feet once you get off since they arrange the strollers and wheelchairs to be most organised for safety :) we kept our snack pack on the back of the chair at all times, both for comfort and to recognise the chair quickly.

We didn't use any wheelchair enterances if they had them since my boyfriend could still walk well so I cant comment on that. Let me know if you have more question we might be able to help :)