This definitely would save time. I can probably safely assume you know the alt Up/Down arrow hotkey for swapping lines (or selected text), but understand that is not what you are looking for.
I have not seen a request for this drag and drop functionality for blocks. During your search, you may have come across this thread for drag and drop bullets and headings: Drag and drop bullets and headings
As a workaround you could select the block via triple click or using a custom macro or vim mode. Once the block is selected, the drag and drop does work. Another option would be to try to find or setup a mouse macro that could accomplish the triple click/click hold in a single click hold (might require a modifier key hold or extra mouse button). Don’t quote me on the mouse macro but after doing a little research, it did seem feasible. Maybe link the feature request or workaround if you find one. I would definitely be interested.
Good luck.
Thanks.