Planning the colony build order is annoying.
It's not very clear as to what about planning the build order is annoying, so I may be missing the point.
Nevertheless here is my take on "colony build order". With adjacency bonuses and "coordination" buildings, such as research coordination and solar power plants, and super projects, the build order and location combined gives a extra importance and extra choices to colony management, which imo, is a very good thing. Planning colonies (in combination with each other) is now a detailed and critical task. That it is more difficult to do it right than, say, in GC2, is also a good thing. I suppose one could ask for a choice to let the colony build itself (auto build), but to my mind that is just subtracting some of the strategy from a strategy game. However, you are free to dislike whatever you want, but I think the new system --- with perhaps a bit of polishing --- is a big plus for GC3.
In terms of managing this build order, the drag and drop ability to relocate items in the building queue is also a big plus. There is a small issue when the build queue is long in that it may take a 2 or 3 drags to get an item to the top of the queue, but that is a small thing and may be improved as part of polishing.
Just my 2c.