Ok, no DW. But why not??

Hi guys. I am starting to code and graphic design. I've been reading lots of threads and people keep mentioning over and over; "Don't use DW, use notepad!!!." Is it because DW gives us the tags and stuff, and by using Notepad we learn more? I just like the way the code is organized in DW and is colored.

Can someone clear this up for me.?