DHH made jibes at Java and co in his keynote, one of which was claiming that Ruby just doesn’t need an IDE as it is so simple… and then a little backtrack saying that they are nice but aren’t AS needed as for Java where you MUST use one.
I think that you can program in textpad for everything, and IDEs can be custom tools that help you get your particular job done. The better the IDE the more productive you are.
The item that I am missing from IntelliJ when I use Textmate is the simple control-click where you see a method and want to go through to its declaration. With IntelliJ (and Eclipse and …) you find yourself clicking through files like nobody’s business.
With Textmate I have a bit of a plugin hack that uses grep but it isn’t even close.
If anyone knows of a plugin that can make this happen I would love to know about it :)