The three features I use the most are:
- Automatic line numbering
- Zoom in/out without needing to change the font size
- Search and replace feature
After using this product for years, there is nothing that I would change about the product, it simply works great. There have been no downsides to the product. When performing more complex coding in VBScript, Powershell, ASP/ASPX or PHP, I often will choose an application specific editor, but for quick fixes/edits, Notepad++ works wonders. And it is also very fast.