I have grown warmer to the 7 inning double headers and the runner on second base rule. When I first heard about starting extra innings with a runner on 2B, I thought it was the stupidest rule I'd ever heard of. Having seen it in action, it's not bad. I kind of like the extra strategy that comes along with it. I think I would still prefer not to have it once we get back to 'normal' times (for me, there's something to be said for those 15+ inning marathons), but if they did keep the rule around permanently, I would not hate it.
I could also live with the 7 inning double headers. I will say, however, I never quite got used to it last season. The game would come to an end, and I would always be thinking that there were still 2 more innings left to be played.