Haha. I find that quite nice, to be honest. I know, I'm lazy... but I only use the menu that pops up when I'm setting IDs or classes to link things to my CSS.
I'm just looking through the Dreamweaver options now, and it looks to me like you can turn things off. Under preferences, Code Hints looks the most likely - things such as turning off the automatic closing of tags, and code hints.
Nice! I bet my comp teacher will yell at me for doing that but o well. She yells at me for making the web site in HTML that i'm suposed to follow some directions for!!
<script type="text/javascript">alert("remember when scripting attacks worked?");</script>
Preferences in DW is under Edit, if you didn't know. Always trips me up, that - I expect Preferences and Options to be under Tools or Options, not under Edit.