Hi Chris (and welcome to TR )
longer workouts have their benefits, as they provide higher stress “density”, in particular for those workout which are attempting to have you work once you have depleted your anaerobic capacity.
That said, if you really don’t like them, it’s your training plan, you do what you want , what works for you.
If instead you want to give it a try (you can always change things up later), here’s a couple suggestions:
try outdoor workouts! If you have a power-meter it’s easier, but you can do them by RPE too (it just requires a bit of practice). I love riding outdoor, it feels easier and more motivating to me, so if I can squeeze it in my schedule, I’ll take outdoor any time
Bring your own entertainment: listen to a podcast, watch a bike race video… whatever works for you. It’s going to help time pass by quicker and you’ll go through those 90 minutes without even realizing (except for the pain, that’s just part of the package). I personally use Zwift (with TR controlling the trainer) and listen to music (podcasts only work for endurance for me, above that I can’t focus…)