A few weeks ago there was a wait at the F/G MSP skyclub. I've encountered waits two days in a row at ORD a few months ago but there was bad weather and flights were getting cancelled like crazy and the ones that weren't cancelled were severely delayed and I think the next day were the passengers that had their flights cancelled the prior day.
I know people have been complaining on the flyer talk Delta diamond group about FLL having long waits.
I wish Delta would give priority to skyclub members and people on Delta One tickets over am ex card holders when there is a wait.