I've built one or two to use as a ladder to reach higher places.. it's quicker and cheaper than stacking stackable conveyor poles :P
Tooltips might be neat, but I would be annoyed if I need to repeatedly climb up to check the overview and then climb down to make adjustments to a building. If they make it possible to also make adjustments from the lookout tower, it would be much more convenient and useful, but.. I feel that takes away from the joy (?) of roaming around amongst the buildings to examine and tweak them.