I'll start out and I'm sure you'll get some other replies.
Advantages:
- the handicapped viewing areas are usually in spots that have a good view of the parade.
- the areas are monitored by CMs, so you won't get someone standing in front of you halfway thru the parade.
Disadvantages:
- for Illuminations, sometimes the wind blows the fireworks smoke right into the handicapped viewing areas.
- if it's busy, you will need to get there early to secure a spot and once the person with a disability goes into the area, they may not be able to leave without possibly losing their spot.
- if it's busy, it's possible that at least some of your party may not be able to stay in the area with you.
- the wheelchairs are usually lined up almost touching each other across the front of the viewing area.
We usually prefer to find our own spots. DD doesn't like to stay in one spot and she especially doesn't like people parking next to her close enough to touch.