can you get a dr's note with a diagnosis on it and give it to guest services-they can issue you a pass-you'll have to use the wheelchair entrance but the wait shouldn't be too long and definitely a quieter area
toys to play with, snacks and drinks
That is not correct information.
You don't need a doctor's note. You can
choose to bring one if you want, but the CMs may not want to see it.
It is illegal under the Americans with Disabilities Act for them to require you have a note to prove your disability.
As KPeveler mentioned, most of the attractions have "Mainstream Access" for people traveling with wheelchairs, which means that the lines are wheelchair accessible and there are not special wheelchair entrances.
Actually guest services will not look at a note - it is illegal for them to require it, and most places are concerned about looking at it for HIPAA reasons.
As Ms_Butterfly, HIPAA is not the reason that WDW CMs don't want to look at the doctor's notes. It's illegal because of the ADA for them to
require you to have one to prove a disability. If you want to bring a note, that's up to you.
Most CMs don't want to look at doctor's letters or have a diagnosis because they are not usually very helpful. Many of the letters just say something like "My patient has xxxxxx. Please extend him every assistance."
That doesn't tell much about what assistance is needed. Some patients with xxxxxx may need yyyyyyy assistance, but some may need oooooo assistance and some won't need any assistance at all.