- Loads up fast, supports tons of very useful packages (e.g. TextPastry, SQLTools), extremely customisable.
- Multi-cursors, multi-panes (e.g. with Origami), spellcheckers, extremely fast filesystem integration/browsing/preview (whether with/without projects and workspaces), color/UI schemes, syntax highlighting, search browsers, Git support (particularly when used with Sublime Merge), etc.
Sure I love my Jetbrains IDEs and Vim, but nothing comes close; Sublime Text is in its own league.