Yes and no, the 'best' way to design a html website is a sliced photoshop file saved as html then code/text added in dreamweaver. This is great first time round but after that i find myself just editing the html script in the ftp program.

When it comes to php files then yes, all off the php and html is edited as text.

When you can visulise table layouts and know what # colours are just by looking at code you know you spend to long designing websites!