[TickleSteve]

for me, regex find and find-in-files is very important for analysing large codebases. Sublime is close to ideal for this (for me). (Multi-line regexes also very useful).

Don't tend to copy large portions of files around, but goto-line is used fairly often and some kind of programatic interface (REPL-style) would also be good, similar to the Sublime console.

Plugins are also important for the long-tail features that are very niche.

...but... speed and lightness is also very important.... so don't use JS/CSS/HTML... please.