I can see why you would be getting nervous just based on reading this thread, but I will say don't worry just based on what we are all writing here! I know when I write about a negative experience that I had related to a CL, it is still a very tiny event in what overall is a great trip, just the fact that we address it and others then chime in makes it seem larger and more important! I have stayed at all of the CLs except GDT, AKL, and CR tower club, and while I have favorites I would stay at any of them again without hesitation. Each resort and CL has drawbacks and benefits, and rarely do all of the benefits line up to point anyone just to one CL

. For example, we love the vibe and views from the Poly, but the prices are often higher and the lounge tends to be busier. We love the views and walkability from the CR but the resort itself isn't our favorite. I love walking to 2 parks from the YC and BC and SAB is amazing, but the atmosphere in the lounges aren't my favorite. The food at the BWI CL is arguably the best, but overall I don't like the resort as well as some others. I love the GF but much prefer RPC over SL, and my boys prefer other resorts (once you can walk to the MK from there is will move up even more on our list!).
As for alcohol, I wouldn't worry at all about that. They all have it and it is always available in essentially unlimited amounts. Sure, it's nicer to serve yourself and I certainly won't argue that they shouldn't appear to judge, but in the grand scheme who cares! Just be pleasant and ask for what you want, and if they aren't super friendly don't worry about it and feel bad for them that they are such miserable judgy people who should be doing a different job. Or are maybe having a bad day or going through something personal. FWIW, I've never had any real issues getting alcohol at any CL, self serve or not. Occasionally I have had to wait around to find someone when it's off hours, which is mildly annoying but not the end of the world, and I've had CMs range from amazingly friendly to barely passable. I admit I do get annoyed and have a difficult time letting things go without perseverating on them, but it would be the way to be and I really do try to just let it roll off of me. I don't want to let a bad CM ruin any of my vacation, and if it's bad enough make the appropriate call/email to talk to a manager and move on.
If I were you I would pick a resort based on where you'll spend most of your time. If that's the Mk do the GF, and if it's Epcot and/or DHS stay at the YC/BC. For the price difference I would probably do GF over the Poly, unless you're talking Poly with a view and then it's harder lol - I do have to say I really prefer the Poly over SL for the lounge atmosphere, but when you factor in price that can often change things and it certainly isn't bad. I think you will find that you will have a great time at whichever resort you choose, and while it's good to be informed sometimes reading these boards makes you worry too much! Just remember every person has a different experience, and it's not uncommon on here to read about someones great experience and then someone else terrible experience, and realize they were at the same CL at the same time! It's all in luck and your personal interactions/experiences.