I definitely like having the screen. When it dims, you can just say your wake up word and it comes on right away. You can also turn the screen off via voice control. I just heard that YouTube is back to use with the Show, but I'm out of town for the holiday week so haven't tried it yet. I really like having the screen to use with lists and timers /alarms. I use the photo function as well, mostly for real photos, but I have a "reference" photo album as well, with screen shots of documents, like all the Sleep Sounds choices, for example.
The one drawback for me is that, being used to the 360 degree sound of the basic Echo, I've found I don't like the sound of the Show quite as much. I think the tone quality is actually better on the Show, but the sound doesn't fill the room the same way. I actually have Sonos speakers as well which recently got a software update to allow for Alexa voice control with existing Alexa devices. So to be honest, I mostly use those for music now. I do like using the Show for music when I'm listening to something new, and want to see track titles and other info on the screen.
Overall, I really like the Show and to me, the screen dimming is a minor issue and no big deal.