After spending a sufficient amount of time in both Washington, D.C. and Belfast, N.I...I can safely say, that the public transport in Ireland is a HUGE step up.
Although, I do love the D.C. Metro Train, I took the bus from Dundonald to Belfast every morning this summer, and LOVED it. Not only were they MUCH cleaner in comparison to D.C. transport, but the workers were much friendlier, and overall I felt much safer.
Not to mention, it gave me a huge sense of satisfaction to be able to take the bus myself without the help of my boyfriend.
I did notice, that most people only used the stop bell when they wanted to be left at a stop where not many people got off. After getting used to the route, I noticed there were always some stops where many people got off the bus, and there were some where nobody got off. There seems to be an understanding between the bus riders and the drivers as to which stops require bells, and which are just implied. Luckily for me, I was getting off at the last stop of the route, so I never needed to worry about the bells issue.