Plan or no plan?

I love reading blogs and reading the perspective of others. Recently, I have been reading the AG Think Tank blog. The topic of planning came up.

I am a planner. I like having a game plan for things. It is the only way that I can get all the things that I want to accomplish done. This is no where else more important than when I plan a worship set. I first start with song selection. I look through my list of songs and I start studying the chord charts and transitions. I make sure that they key are relative, or that I can at least transition from song to song. Then I look at the themes of the songs. Do they relate? Are they compatible? Am I going from a song where I say that God has made me who I am, to a song where I talk about how terrible I am compared to God (there are songs that at least give that assumption)? Then I look at the time restraints I am dealing with. Finally, I look at the difficulty of the songs. Are the songs easy to play so that my team can worship along with those who are singing?

I find it important to plan out things. I want to know what everyone else thinks? How important is planning in a worship set?