I know a lot of people in the Ruby community tend to believe in using text editors with limited (or no) semantic understanding of the code. I've found that using, for instance, JetBrains Rubymine tends to make typos and related bugs apparent as they happen. Not to mention providing autocomplete that usually feels like using a statically typed language.
New to Ruby, veteran Java/C++, while I'm liking what RubyMine adds, it's nowhere near what I get from a simple language with a simple type system like Java.
