I dislike IDEs for all their features which for the most part I think just add clutter, since I've ever found a use for most of them like debuggers etc. but I'll admit that they are useful if done right and can bring a productivity boost.

When I have to write things like:

    strstr($str, $delimiter)

and

    explode($delimiter, $str)

Netbeans ctrl+p comes in very handy in re-enforcing my choice of arguement order because if I make a mistake that's a very subtle bug waiting to happen.

or when I have to wrote things like:

    g_file_new_for_commandline_arg

who wants to type that out when they don't have to?

or this over and over:

    AStudpidlyLongName::

when I can just type `ast` and press ctrl+[space] and get the name in a completion list highlighted every single time.

or:

   m_ui->tooBar->addWidget

when I can m_ui.t... and have to automatically figure the correct sequence, this comes in pretty handly when you're working code written by other and they decide to use hard objects as opposed more common pointers.