I would highly recommend going on your own.
I just did a 12 day solo trip and it was the best trip I have done to Disney in a long time.
Benefits include:
No waiting on others to get up. I saw a lot of people not getting on busses in the AM because they were waiting on other people. I was talking to one group that watched 3 MK buses go by because they were waiting on someone.
No people whining it's too hot.
No people telling you to turn the light out and go to bed when you are posting to the dis boards.
No people complaining they are tired (I did a couple of 16 hour days with EMH I could not do this with others)
No issues with people who will not eat certain things. I heard a lot of complaining from people that were traveling in groups. They were waiting on this one or that one so they could make an ADR. This one did not want to eat at that place. Etc.. etc..
No one to say lets move along when you are enjoying the Tequila bar.
You can move through the crowds very quickly to get to the early safari in AK or to get a fast pass for Toy Story.
Single rider lines. - You can do the rock and roll rollercoaster or Expedition Everest 6 or 7 times in the same time a group can do it once.
Eating at the sit down locations can be somewhat uncomfortable (depends on you), but the QS locations are surprisingly good. In 12 days eating QS I never had a burger and only repeated two meals because they were so good.
You can also dine in Germany and know you will be put at a table with other people and will most likely end up talking to them unless, for better or worse.
Getting photos with the characters are a little odd, but I did it since my son would appreciate it, but I felt the staff was a little odd about it. They did SEEM to make some assumptions about a guy by himself getting a photo with Mickey & Minnie at the toon town fair when I picked up the photos (you get a free photo so I am going to get it).
There are always people to hang with at the tequila bar in Mexico.
There is probably a good chance you will meet someone from one of the dis boards, especially around the holidays. If you see someone taking a picture of a drink or a meal, they are probably from this site.
There are always people to talk with in line, especially if they are nervous about the ride.
For the most part they are OK, but you get the occasional idiot who might say something stupid.
<Begin Rant>
I still can't believe I witnessed this. There was a cute 20 something girl waiting in line for soaring and she said she was a party of one and the woman behind her said to her "that's sad". She did seem off put by the comment. She has no idea why this person is by herself. Did her boyfriend leave her at the altar? Did someone pass away? Is she just doing a baby swap. If she terminally ill? You have no idea, so why comment.
<End Rant>
Anyway I will most likely go again on my own. Even if I do bring the family next time I will leave them at the pool a few days and do the parks on my own.