GUI code generally ends up with lots of similar looking code to manage layout tasks. Often that can be tided up with helper functions that lay out a row of controls or set up a table row or whatever the task might be. Using hashes for common parameter sets helps a lot too. Often tossing display elements into an array the running over the array to get stuff packed in the right order helps too.

At the end of the day the techniques you use to clean up repetitive Tk code are much the same as the techniques you use to clean up any repetitive code - refactor the repetitive bits, reduce, reuse, recycle.