I've flown out of Grand Rapids a couple of times since the renovation, and was able to enjoy a beer or two at the Founders bar... it was really nice to have that option! There's another bar within concourse B that has been surprisingly (to me anyway) full each time I've been down there. It actually reminds me of something I'd see at a larger airport, although to a lesser scale. According to the airport map on their website, it appears that there is also a bar on concourse A, but I haven't been through that concourse to check it out. Regardless, it seems like there isn't an option to sit down and have a drink any more as an un-ticketed passenger.
http://www.grr.org/terminal-map.php