Personally I am helping neighbours to actually HELP them, as I like helping others.
Also.. it gives me certain benefits in return ofcourse. Coins are no longer important to me, as I have well over 500k of them. However, the various other boosts of culture, construction and so forth are greatly appriciated.
All I am saying is, that "a scrolling feature" (as suggested here and in other threads) are needed. It may work just fine now, but in the near feature it will be a dawnting process going 200, 500, or more neighbours. First locating them on the map, clicking into their city, clicking the desired building, for to repeat the process over and over again. There needs to be a more sustainable and userfriendly method in the future, as I am nearing my 50th neighbour... and my fingers are cramping up.