Err, I doubt it takes less effort to customize Vim.
OTOH, I like to use an IDE like NetBeans to navigate Ruby code (go to method implementation, go to class implementation, etc).
I'd say it depends on what kind of project you're working on. If you're writing a small one-off script in Haskell, you probably don't need to use an IDE. The same goes for Java.
Once you integrated 3rd-party libraries (like not just one, but say, 5 of them), you either have to memorize those libraries or be grateful that IDE can help you.
OTOH, I like to use an IDE like NetBeans to navigate Ruby code (go to method implementation, go to class implementation, etc).
I'd say it depends on what kind of project you're working on. If you're writing a small one-off script in Haskell, you probably don't need to use an IDE. The same goes for Java.
Once you integrated 3rd-party libraries (like not just one, but say, 5 of them), you either have to memorize those libraries or be grateful that IDE can help you.