What's the point of having to click building X, wait 5 turns, click building Y, wait 5 turns, then click building Z and wait 5 turns for _every_ city? This isn't a matter of interesting choices (in the words of Sid Meier), but mind numbing micromanagement. In mid to late game, I set my new cities on automated production just to save me this hassle. One can make the buildings require a later tech, so building the buildings now provides a much needed boost until they become universally available (plus if the national wonder gets captured, suddenly the difference between the "free" building and the "real" building becomes apparent!). Alternately, these wonders can also require X number of a building already be built, much like the Great Library or the Theater of Dreams require their respective pre-req buildings.