BUG: map method on datetimelikes should not work arraywise
- [x] closes #51977
- [x] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [x] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [x] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

Thanks @topper-123  > _Could_ be framed as an API change, but I am okay with calling this a bug especially since dicts/Series map elements.

Thanks. I was on the fencer too, but think I would feel it was  a bug if this didn't work elementwise + the code is so much cleaner now:-)