For me, that is certainly how my use of leading comma began. But to be entirely honest, if Haskell were to one day suddenly begin supporting both trailing and leading commas, I would start writing what @centril wrote. Leading punctuation makes structure more obvious, because it lines up.
I'd probably even take leading semicolons if the world wasn't so entrenched in the current standard syntax (and were it not for the whole semicolon-equals-unit-value thing in Rust). It would certainly have eliminated the majority of those dumb edit-recompile cycles where I forgot a semicolon, or put one after a braced item. Thank goodness now for IDEs/RLS...