No, it is much nicer than the 737/A320 class. Just thinking of the curve of a 737 makes my neck knot up. Bigger planes like the 747/757/767/777 are much more comfortable as well as modern planes like the A220/E195. 737 class planes are so ubiquitous that many passengers have no idea another experience is possible.
The 767 2-3-2 layout is my favorite, with only 1 middle seat per row, yet still two aisles so you can use one while the other is blocked, or walk little loops if it's not.
I always do, but, just this Saturday, due to some air-traffic meltdown (perfectly understandable considering the heat wave), we had our aircraft swapped for a slightly smaller one, and I had to renegotiate seats to be together with my kid.
The 737 is noticeably louder than other planes on the ground and in the passenger cabin and especially for the pilot. 787/A350 and the A220 have a higher cabin pressure and better air quality that helps you feel better. It could be that most of my wide body experience was going over the Atlantic on 747s in the 1990s and a few times circa 2012 flying 767s on the JFK-LAX route which felt luxurious. As I see it, I’d rather fly coach on a better plane than “first” on a worse plane. (e.g. first on a 737 is like business on a widebody, in an A380 first-class is crazy over the top) 737 first still has your ears ringing, under-oxygenated, feeling cramped inside a small cylinder, etc. Luggage bins are nicer on a big plane too.
I’d take first in anything, even crappy fake “first,” over coach in anything. Additional personal room trumps everything else for me. I don’t really care how big the fuselage is, I care how hard my knees are crammed into the seat in front of me.