I do find that if you extend your questions past GH into other rythm games then the skills you learn can be brought on through into real playing.
Take the DrumMania and Rock Band drumkits. While the kits themselves are incredibly simple, they do teach you the core ideas behind drumming which can then be brought on into the real thing - rhythm, beat, timing and control.
Also take into case Beatmania IIDX. This is the a sequel to the original DJ mixing game and while it appears the new wave of DJ games [http://kotaku.com/5060736/scratch-ultimate-dj-wikkiwikki+wahs-on-to-ps3--360] will just have a similar colour layout on a flat plain like Guitar Hero's guitar, the original Beatmania actually had a 7-key keyboard-like controller [http://data1.vgl.co.kr/contents/special/beatmania/ASC-003.jpg]. This same controller actually helped me turn into a somewhat competent keyboard and piano player, despite the fact that is not a perfect rendition of the real thing.
I think the issue is not that Guitar Hero simplifies guitar playing - hell some of the songs actually are harder to play than in real life, including the infamous Through the Fire and the Flames - but rather that it doesn't really have enough in common to the instrument its based off when compared to gaming drumkits and the beatmania controller.
Take the DrumMania and Rock Band drumkits. While the kits themselves are incredibly simple, they do teach you the core ideas behind drumming which can then be brought on into the real thing - rhythm, beat, timing and control.
Also take into case Beatmania IIDX. This is the a sequel to the original DJ mixing game and while it appears the new wave of DJ games [http://kotaku.com/5060736/scratch-ultimate-dj-wikkiwikki+wahs-on-to-ps3--360] will just have a similar colour layout on a flat plain like Guitar Hero's guitar, the original Beatmania actually had a 7-key keyboard-like controller [http://data1.vgl.co.kr/contents/special/beatmania/ASC-003.jpg]. This same controller actually helped me turn into a somewhat competent keyboard and piano player, despite the fact that is not a perfect rendition of the real thing.
I think the issue is not that Guitar Hero simplifies guitar playing - hell some of the songs actually are harder to play than in real life, including the infamous Through the Fire and the Flames - but rather that it doesn't really have enough in common to the instrument its based off when compared to gaming drumkits and the beatmania controller.