There can be lengthy lines, especially in the early morning. EMS or OLCI will make no difference. Depending on when your flight is, UA might have moved out of terminal C, which will create more space.

IME, the bag drop-off lines aren't that bad, but do prepare for some waiting. Assuming you aren't alone, you could have one person compare the outside and inside lines. I have seen plenty of times where the outside (curbside, with fee) line was longer (and colder) than the normal line.