Hi Suzanne, welcome to the forum

We visit DLRP under very similar circumstances and let me put your mind to rest - the accessibility passes work like a dream!
Well go about 3/4 times a year and haven't been given a return to me for any ride in over a year. You predominantly enter via the exit and a CM will ask to see your pass. For most rides in fantasy land the wait time is normally 5 minutes or under. Pirates of the Caribbean /phantom manor/space mountain/ Autopia are normally walk on. Storyland boat trip is the longest wait in the park as there is only 1 boat for accessibility passes so depends on how many people are waiting in front of you but you can always try again a different time (worth it as it is a lovely ride)
For the Studios, everything is normally walk on other than Ratatouille as you have to wait in the fastpass queue with everyone else for this ride so can be around a 15 minute wait. And if you need the special accessibility "rat" it may be a further wait inside as there is only one. RC racer can be quite a wait too depending on how many people in front of you as again there is only one vehicle. We are not permitted to use our accessibility card for parachute drop so I'm assuming you will get the same one as us. The only time we have been able to do this ride was first thing in the morning when the studio first opens before the queue builds up.
You can use your accessibility pass to stand in a roped off area for parades and Dreams (we are only allowed 1 carer in with the pass)
Even in counter service restaurants, the CMs will help you with a table. Sometimes when it's really busy, you are not allowed to a table until you have been served, if you explain about your needs they will let you sit while someone else queues.
I can't rate DLRP highly enough for their attempts to make lives easier, nothing is too much trouble. You will have an absolutely fantastic time! Feel free to pm me at any time.