It is extremely nice. Yes, is nauseating to be around someone who's "gooing" (as I call it), but I suppose it's not a bad thing, just annoying to be around two people who are in gooey love. When I was dating, I tried keeping my smoochy happiness on the downlow since a lot of my friends didn't have boyfriends. I, personally, am of mind that baby-talk, making out, and excessive stuff like that should be kept between me and my boyfriend and not be displayed in front of my friends. It's common courtesy.
I fear what I'll be like once I'm engaged. Welp, that's not for a while, though, so no worries here!