Watch a good film and non of this matters lol
I absolutely get that sentiment. I grew up loving many movies on old CRTs. As I think I mentioned in this thread, I would go over to friend's houses who had crappy old CRTs to watch movies and they'd ask "why do you like coming here to watch when you have a big nice home theater?"
It's because for me "the experience" of watching a movie is enriched when it's a social activity, and when I am getting out of the house.
I'm happy as a claim watching movies with other people, on their "more modest" displays. A good movie is a good movie.
And in no way do I like a "screen size/quality" snobbery where one looks down on whatever someone else is using. We don't all have the same goals. (Ok, ok, yes, I do start to get bummed about people watching movies on an iphone screen...but, hey, as a film fan and being in the business, I'll cut myself some slack in hoping for a little better experience for the audience).
All that said...
Screen size matters, I can't really stand anything less than a 27 for my PC monitor (30+ would be ideal) and TV 55 feels small to me now, 65+ i preferred range.
For me screen size certainly matters in that it can transform the experience. I remember in the late 90's going to see The Wizard Of Oz, released briefly to theaters. We'd all seen it plenty of times on TV growing up, but it was just brand new, a revelation, to see it on the Big Screen as it was originally presented. To see that world "life-sized," all the details in the sets, costumes, the actors, the acting, the extras, it refreshed the movie.
This is what I keep getting from a big screen projection set up. It's not just about seeing the latest movies look their best, but the thrill of seeing many of my favorite movies of the past, which I'd only ever seen on small TVs, presented life-sized and in their proper aspect ratio. It's like seeing them all again for the first time.
The other thing I like about a larger image size, something that I kept noticing, was it provided a more consistent and continuous connection with the actors. By that I mean: movies tend to move from close ups, to mid shots, to full, to long shot, establishing shots etc, and on a small display it's in the closer shots that you see most clearly the expressions of the actor. When the shots are wider, you get less obvious expression and it's more about seeing the set or physical activity of the actor. But on a big screen when it cuts from a close up to a medium or wide shot, the actor's face remains big, you can still see the acting much as you did in the close up, so there is this continuity, an attachment to how the character is thinking and feeling that feels richer and more nuanced. (IMO). So, those are notes from a Big Screen fan. But then, I was always the one seeking out the biggest theater screens on which to see movies, and I often liked sitting closer. Those with the "I like the back of the theater" mindset may think differently about these things.
For me a good movie is a good movie. But even then, a good movie is elevated by a good big screen image. (I grew up a massive fan of Alien, saw it on a huge screen when it first came out, then on TVs for the rest of it's existence. When I finally put together the big projection set up and fired up Alien in HD at home I almost wet my pants in fan-boy glee. It was like re-experiencing it at the theaters again, where the spaceships were no longer toy-sized but had that "big ship cruising over my head" impression, and all the sets looked like you could walk in to them).