I agree that permissive licenses have their place for smaller projects (I personally use CC0 from small programs). The FSF suggests Apache license for programs with less than 300 lines (approximately) in order to avoid the overhead that you mentioned. The LGPL was also created in cases where allowing your free code to be used in nonfree contexts can help advance free software as a movement (e.g. writing a free replacement for a proprietary codec). But I also believe that if you really want to support free software, you have a moral duty to release anything "big" that you make under a copyleft license.