I don't agree. I'm not a fan of bloated software (i.e. features I don't use, etc.), but one thing that Wordpress and Typepad have going for them is a large user base that helps to uncover bugs like security flaws.
Rolling your own, while a good exercise, will most likely lead to problems.
I'll second PyDev Eclipse. I just started a Python project after not using Python for several years, and have been fairly impressed thus far with PyDev.