I'm lucky that I'm able to come during a time when everyone is at work, so I can't really comment on the busy times.
My biggest complaint? One of the check-in staff is the rudest person I've ever encountered. He never says hi, I have to ask for a towel each time, and he's just straight up impersonal, almost to the point of being hostile. Dude. If you don't like your job, get another one. Everyone else I've ever checked in with manages to make eye contact, say hello, and glance at the screen to know that I get a towel.
Other than that, I enjoy coming here because it's clean, fast, and people don't really bug you.