CMS plugin support

Hi! I have a bit of a vague question. I have always used different selfmade basic "CMS" for web pages. That works fine, and I like having my own structure and light code weight. But the big pro with using a standard CMS like drupal is the plugin support. Are there any php plugin standards or is there a doable way of implementing support for drupal (joomla, whatever) plugs? Of course there are php libraries, but I would like something more lika a visual gadget and extremly fast implementation. I created a wordpress blog instead of using my own code a while ago, and implementing twitter support, antispam, etc was just two clicks and 2 min work, instead of reading a manual for a library and maybe half an hour an hour work implementing and debugging. And that was a nice change. When you make normal simple web pages do you guys use a ready-made CMS as a base or do you have a self-made php template, or self-made cms, or what solutions do you use? Kind Regards Emil Edeholt