Question: I often find myself changing text colors to the same color for five minutes at a time which is really unnecessarily mouse-intensive.

Answer: 
If the last action that you made was to apply the color then use Redo `Ctrl` + `y`
1. Copy the cell that has the formatting that you need (Ctrl+C)
2. Paste format only on top of the cell(s) that you want to be formatted the same way (Ctrl+Alt+V)