I thought the same thing during the year I had my INC and up until about a month ago on my Bolt which I have had since launch. I liked Sense an had no problems with it. I was bored one night and gave a couple of launchers a quick try. Now I am a confirmed GO Launcher guy, in fact I switched from Handcent to Go SMS and use Go Contacts as well. The Go apps are all smooth, have many features not found on the stock Sense apps once you start to explore and improve an already great experience.
I also recommend home2 shortcut whether you use a launcher or not. It allows you to create shortcuts with a double tap of the home key, one for a tap of home then menu, home back key etc. Very useful. Gives the home keys more than one purpose.