FWIW: when I first started using Tk, I found pack really easy to use. As time wore on and I started doing more complex things that required a greater degree of control over the exact placement of widgets within a form, I started to find pack very limited, and moved to mostly using grid, and only using pack for quick little things. I don't think I ever used place.

The issue is, when you come to do ammend your app in future, will the geometry manager you have used give you sufficient control over placement? If you're happy that place will, I see no reason not to carry on using it.

Update: AFAIK, the only thing that is likely to bite you is the varying behaviours of the geometry managers when you resize a window. As long as you know what to expect, it shouldn't be a problem.