It's very hit or miss. I'd expect tonight to be fairly well populated. (The 10-to-30 minute wait scenario listed above is overly optimistic, IMO. That's what it was last night and EMH will be more populated.)
Since EMH is only two hours, and is done at 1, it just doesn't have the time to empty like it did when they ran midnight to 3A, where the last hour would be a ghost town. Going from 3h to 2h sucked s lot of the magic out of EMH, IMO.