I have learned more using Rails in the last month than I learned in almost 7 months of programming PHP and creating/editing Textpattern plugins.
I am sure that my PHP programming would be better now that I have started really learning RoR, the only problem is that I will never go back to PHP to find out. I have seen the light, and there is no way that I could ever sit down and do it, knowing that a better, faster, easier, more agile way of doing things is out there.
Glad to hear your good experience. You never know, you may end up having to use PHP one day. I have client sites that use it. Unless there are some major changes being made, porting them over to RoR doesn't make sense for me.