Ctrl-a and Ctrl-e are much faster to type than home/end and do the same thing (assuming a standard readline-enabled command line).
All the keys in the cluster above the arrow keys are really too hard to reach to be of real practical use, IMO. Actually that includes arrow keys as well. Just too far from home row.
The reason for this is that git rebase is kind of like executing a separate merge for every commit that is being reapplied. A proper merge on the other hand looks at the tips of the two branches and thus considers all the commits/changes “at once.”
You can improve the situation with git rerere