I do watch Station 19 (and I like it), but I am getting tired of these mini-crossovers too (especially with such a focus on Jackson and Vic, because I don't care for them together at all).
I agree with you completely, at this point, I'm getting pretty fed up with all of the characters now (I kind of like Link, he's kind of fun, hasn't quite been ruined yet, and I enjoyed--mostly--Chris Carmack when he was on Nashville), Karev was my last hold out, and with him gone, I'm just losing interest. Hence another reason why I want the crossovers to stop. If I give up GA after this season, I'd like to keep watching S19 without being forced to tune in again to GA (if I quit).