Doorways are at least 32 inches wide, which is considered wheelchair accessible) and most are actually 36 inches wide.
Animal Kingdom and the Studio were built with Mainstream Lines, which means that the line is wheelchair accessible, with 36 inch wide lines and turning areas of at least 5 feet in diameter.
MK and Epcot were not built with Mainstream Access, but it was added as much as possible as attractions were added or renovated.
Post 11 of the disABILITIES FAQs thread has a list of attraction “Mobility Entrances” for the attractions at each park. In most cases, you will see that it says to enter using the Mainstream Line (or they also use the words “Standard” or “Regular” queue.
You can find the disABILITIES FAQs thread near the top of this board or follow the link in my signature.
I know if there's a turnstile, I need to use the WC entrance, but are there any other rides that I need to know at the beginning that I won't fit at the end?
No, you won’t.
WDW has been removing turnstiles as they do renovations because they cause problems for a lot of people - some people have trouble getting thru them and small children may bump their heads on them.
At this point, there are very few turnstiles left. If you do encounter one, there will always be a wheelchair gate or a wheelchair bypass around it. CMs will see your mobility device and direct you the correct way to go if it’s not the usual path.
Any tips at all would be so much appreciated. I have gone to the world in a WC which was just a disaster because I didn't stop off and talk to anyone in guest services
Not sure what you mean about this.
All attractions are wheelchair accessible up to the boarding area with a very few exceptions (Tomorrowland Transit Authority, Swiss Family Robinson Treehouse, to name a few).
Guests who have a wheelchair, ECV, or visible mobility aid like a walker, cane or rollator can use the Mobility Entrances without using a Guest Assistance Card or getting any assistance from Guest Services (more about Guest Assistance Cards in post 6 of the disABILITIES FAQs thread).
My biggest advice if you have not used a rollator much would be to go out for a full day of shopping with one and see how you feel with all the walking. Some people will do fine, but others will want to use an ECV instead because the walking was too much for them.
You might also want to alternate days walking with using an ECV if you think you can walk, but just not every day.
I would suggest getting one of the special maps for Guests with Disabilities for each park. In most parks, you will find them with the other maps as you enter the park - they have a black band at the top and say they are for Guests with Disabilities. If you don’t find them with the regular maps, you can pick up a copy for any park at Guest Relations.
Those maps have the Mobility Access listed for each attraction, so it is all neat and easy to use.
. Unfortunately, walking around the block doesn't really prepare you for the miles of walking, and even worse, STANDING in line that I will need to do. I'm just hoping my body will be ok with me. I've been trying to be kind to it
