Yeah, single rider for a two-across row can be really hit or miss. It actually went by pretty decently for Incredicoaster at DCA when I used it in 2019, while I swore off using it on Hagrid as that took forever the handful of times I used it.
That said, I would love to just skip the pre-shows for Cosmic Rewind. It doesn't age well on repeat visits, and it hinges on a whiff of an effect. It really makes me appreciate Tron's pre-show which wastes zero time giving you a cool little moment/effect, and getting you in.
I also noticed on socials some folks are still clinging to "But 3-4 hour lines outside!!!", you would think they would drop that after the mythical lines never materialized for ROTR, Tron and so forth, but I guess folks need something to cling to.