I shift gears on my bike like I'm shifting gears in my car. Shifting to a lower gear when approaching a red light, then shifting up quickly to gain speed on the green.

My shifters are very "clicky" and I find them a bit annoying. They're the stock shifters on a 2013 Giant Escape 2 (Shimano M310). I'm probably just looking for an excuse to tinker with my bike but, are their quieter shifter options out there? It would be nice to have a smooth, quiet shift.