It’s a day and a half, of which 3-4 hours will be in Galaxy’s Edge. I’m a very casual fan but I think some light sabre training, playing pew pew on the bridge and some role playing will be quite fun.
If you want to see what the kids are up to then you’ll have to at least go with it, even if you don’t actually play along. (But that could quite wearing for you and them, nothing will annoy them more than having Mum hanging about looking fed up.
)
But if it really isn’t your thing then there’s a lounge to chill in. I’m sure the bar staff will happily chat to you. Or if you really can’t be bothered, you could skip the return to the StarCruiser, hang about in DHS and then just get an Uber back to the front entrance.
I guess people in that position, be it Mum or Dad, have to decide whether to go with the family even if you know you’re not going to have fun, or have two nights and lots of me time in the parks. 2 nights at POP will probably be cheaper than paying for an extra person for this, albeit you’ll have food and park tickets to think about.