I've only used Haskell to experiment with small, gui, command line, networked projects and within that context I did have those flags enabled (deferer type errors and typed holes both proved helpful).

However I've recently switched to chicken scheme for that purpose, not because Haskell isn't good but because of type friction I encounter when trying to use new libraries.

It's not a rant at Haskell, as I assume were I to use it on a daily basis it would be a nice fit. But as I'm using it a couple of times a year, it doesn't work out.