The handicapped seating is at the top row along the back of the auditorium whether you use the package or not. There are some seats in the front row, but I don't think they are used for the "package people" and you can get wet with those, depending on how much the mist from the water blows into the crowd.
Wheelchair users not using the dinner package do go in the regular line (Make sure to keep to the right, so the CMs can see you). The CMs usually separate wheelchair parties out very quickly and route you into the auditorium to the wheelchair seats.
If you do a pakcage, make sure they know you have a wheelchair in your party, so they save a wheelchair spot. If you don't do a package, there is a status board at the entrance to Hollywood and Sunset Blvd where the CMs can advise you on the best time to arrive.