What United lounges have you been to?
The ones I've been to, for example Newark, have free unlimited restaurant-quality table service, and unlimited premium alcohol, including unlimited Champagne. To be honest I usually look for longer layovers because it's a bit of a treat in there. I love working on their glowing mock-marble bar tops with unlimited iced Champs.
And that's just the basic business-class lounge. I once had the fortune to be in United's Global First lounge in SF, and that was something more again.
https://itstravelseason.com/airlines/united-polaris-lounge-f...
The United affiliate lounges in much of east Asia make United's own look even more embarrassing unless you're in one of the international first/business ones. Although when the Chicago Polaris lounge was new I got stuck there on a super delayed flight and managed to kill a bottle of Yamazaki whiskey almost by myself, which probably wasn't great for my health and against policy but I slept like a baby on the way to Germany when we finally departed.
About the best benefit is if you need customer service to find new flights, no line for that at least. Hilarious you need a lounge pass to get no wait customer service and clean restrooms.