If you already have a good grasp of the filters in PS, I'd say to start ignoring them now and concentrate on learning the rest of the program. In my opinion, curves, levels, color adjustments and layer effects are the most important tools in Photoshop
I'm not saying give up on filters, but once you learn how powerful the rest of the program is and start to see the differences in results of images that were filtered and that weren't, you'll come to understand how unnecessary filters are.
Unless of course you absolutely love them. In that case, by all means... let 'er rip!