Perhaps I had bad luck but I felt like I was in pick-up bar at happy hour and not at a Starbucks as I tried to get some work done near the pick-up counter, where I found a few people more interested in chatting (loudly, basically screaming) with each other and with their friends on the staff than picking up some coffee. We're not talking 5 minutes -- we're talking like 20.
It's always OK to say hi to friends when they're at work but friends need to limit the conversation and stay focused on the job. As for our would-be amorous folks, it didn't seem to work out. So a total wash for all involved.