So I will preface this with saying that I HAVE NOT gone with GT to BM, (I'm a virgin burner this year.)
I have however traveled to Mexico with them twice, once for 3 1/2 weeks and a month. And I will absolutely travel with them again.
I have been told (by drivers) that a a BM GT experience is a lot different.
As a passenger you're on your own a lot more, they mostly focus of getting you there and back,feeding, and watering you. The drivers are there to party and have a good time just as much as you, there are also going to be a TON of GT passengers so you might feel a little bit like cattle and a little less communal.
I think it's important to remember what you're paying for when you hitch your wagon to GT. You are paying to be fed, transported, watered, and provided with a centrally located camp. AND THAT'S IT.
They are NOT going to:
hold your hand
set up guided tours
do all the prep that everyone needs to do themselves
set up your tent
Or generally babysit your drunk ass
GT passengers and drivers in my experience are typically really nice and caring people, (they usually drink too much, but) they will unofficially hold your hand if you need it, (and aren't a tool,) hang out and interact with you, and generally show you a good time.
It's just important to not come in expecting all of that.
Both times I've traveled with GT after they had us sign the "I'm not going to sue you if I get drunk and do stupid shit" form, they said something along the lines of, (legally) you're on your own, in the event of injury, international incident, or water supply shortage, we are not obligated or (legally) expected to bail you out. They then quickly follow up with BUT we will of course do our best to help you and take good care of you.
On both my trips especially the 2nd one, the drivers administered first aid, took ill people to Doctors and hospitals, helped with lost and stolen cards, and generally took really good care of us. It's just important to remember that they are a bus company and not a concierge travel company.
Just because you're with them means you can stop being a critically thinking adult.
One thing you'll want to consider is are you a party-er? I personally do not drink, smoke or do drugs, (including pot,) The average GT group however DOES, and I'd imagine more so @ BM.
So if you can't handle that, aren't comfortable with it, or are in recovery you might want to rethink GT as an option.
The main benefits of GT are they have really good food, and water, so if you don't have a vehicle to haul all that stuff, or you're apprehensive about going it alone then I'd say go for it.
It's kind of nice t have that instant built in community/camp that you can interact with as much or as little as you want.
I would say do you research find people who have done BM with them and buy your GT ticket with them as soon as possible.
Just remember that you will be expected to cook and clean if you're traveling with them. I'm also not sure if they provide any sort of shade structures so look into that as well.
So yeah, to wrap of that long thread I say if you're a flexible somewhat easy going person, who doesn't require much handholding then I think GT is a good option!
Feel free to PM me if you have any questions.