Word completion is a nice little feature that has been in Eclipse for a while, but I've only recently discovered.
It allows you to type a letter or two and then simply press Alt-/ and it will cycle through all words in the file starting with those letters.
(You can of course change the key combo if you want - I've got mine set to Alt-. instead)
And better still, it works quickly - even with large multi-thousand line CF components there is only a slight delay for the first entry appearing. And being a core Eclipse feature, it works across all editors.
One thing to bear in mind is that it is case-sensitive - "w" will bring up "where", but not "Where" nor "WHERE".
I've only been using it a short while, but I'm already finding it useful.
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