The lonely thing only you can answer. Unfortunately, you will probably need to go through at least a small trip alone once to see if it causes you any significant problems. The fact that you bring it up may suggest it's going to have at least some impact on the enjoyment of your visit.
As to other benefits, here are a few:
1. Obviously you have total control of what you want to do. You can choose whatever FP+ you want to do (within park rules, of course, and assuming you arrange them in advance enough that they are available), you can also decide to cancel them (be a good sport and use the app to do so so some other lucky guest can score a last minute for whatever you cancel ) and just wing it if you feel like it for a day. You can also decide to take tours others in your group might be bored with (like if you would be interested in Keys to the Kingdom, but others in your regular travel party couldn't stand the not moving from attraction to attraction for over 3 hours). If you start off thinking you want to see a parade, but then note a really good wait time on some attraction you are wanting to go on, it's OK to wander over to SDMT rather than see Festival of Fantasy for the nth time.
2. Similarly, you can choose to try things that you might not want to risk the financial implications with a full family visit (or at least might not before you have experienced it firsthand), since the cost for trying something solo is much less than multiplying it across a large group. Examples could be trying a sit down restaurant experience you might like to try that may not go well with others in your normal travel party, trying a new high end tour where it is costly but bearable for one person, but would rack up quickly if a whole family were to do it (DAK Wild Africa Trek or Sense of Africa at AKL come to mind).
3. Possibly inter-related with some of the ideas in #1, it is sometimes easier to get a reservation for a small party of one at some of the popular restaurants. While I have yet to do BoG for dinner, I did get short term (probably 2-3 weeks out) reservations for both a lunch and breakfast on a trip probably about 1 1/2 years ago. I've also gotten into Le Cellier on somewhat short notice, got a 9 PM-ish reservation for Ca Grill (Fireworks from the top of the Contemporary!) (on the same day!) and gotten a late evening spot at Beaches and Cream (I forget if this was same day, but I think it was during my trip rather than before it started). You will not likely score popular times for most (CA Grill was likely an odd cancellation, and you probably won't get BoG for a time that gets you into the park early for Breakfast), but if you are OK with having lunch at 2 or so(an example), it can be done.
Those are just some minor examples of the freedom to explore.
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