I'm somewhat of a newcomer to Drupal but have been following the latest developments very closely. After reading the slides posted at webchick.net, I'm quite interested in what it's going to take to get my current installation (6.13) compatible with D7 when it comes out.
For security reasons I always try to stay up to date. But I often find that I spend most of my time managing my Drupal installation and modules rather than creating content. Unfortunately I'm just a one-man operation so right now I'm trying to plan the best way to stay current with D7 while also making free time to contribute to website.
Modules
It seems that D7 has absorbed some of the most useful modules in the core. I know that when I first started with WordPress I went crazy with my plugins and after a SQL injection or 2 I learned my lesson.
My current D6 installation has quite a few modules that certainly add functionality, but I wouldn't consider critical. For my D7 plan, I'm hoping to rely strictly on the Core to build a feature-rich CMS that is also easy to maintain. While there are some modules that add incremental improvements to my site (i.e., Read More tweak) to follow the K.I.S.S guidelines I may leave them out.