We go with the F! package and we are paying out of pocket for it; no dining plan this time, either. I just feel safer having it. I don't feel there's enough wheelchair spots available considering the size of the outside theater. I feel you don't wait as long to get your seating, either. You get a special way of getting in which is not the mainstream way and it's nicer. I'd say this saves you about 15 minutes time. You get to be on the right side as you are facing the theater. I feel this is the better side for exiting. If you plan on leaving right after the show this is closer to exiting the park. Because, we have seen the ending before we even leave early to beat the crowd. This helps with the transportation, too. For your info most of the wheelchair seating with the F! package is off center, but a good view.
If you don't want the package then I would plan on at least an hour ahead to be in the mainstream line. Again, I rather be safe and wait a little longer than to be turned away. Maybe, others can chime in, but I don't believe they accomodate everyone in a wheelchair that shows up. If it's at capacity that's it.
There was one time we were the last one to get wheelchair seating with the package. The place was jammed and we weren't even late or anything.
We're going during the Christmas season most of the time, but not the very week and we are always happy that we did the package. The packages get sold out quickly; so, this has to tell you something in my opinion. MaMa Melrose is probably the best place for a package. Brown Derby is too high price for us. Hollywood and Vine is okay. If all that was left was the Brown Derby and I was paying out of pocket I think I would skip the show.