Bard is so much fun to play, holy crap.
Yeah, the whole bell collection mechanic works really well as an incentive to roam more, maybe try helping mid or jg with your Q, leave them a W and then head back towards bot. Portals are also really cool in how they dissuade opponents from entering them because they could get ambushed on the other side. The downside of playing Bard is that I realized I can't Q well at all, and the times I successfully ulted opponents are equal to the number of times I either missed them or even ended up hitting my teammates by mistake.
I guess I should play Bard against bots and just fool around flinging ults randomly to get used to the channelling time, since I've barely used it against people and not understanding how much should I lead opponents when casting it will probably result in some disasterous situations and me getting flamed. The threat of actually turning the tide against my own team with it has probably dissuaded me from casting it nearly as much as I should.