That's pretty much the case for me - I love watching the Doctor, but I don't read or write fic. In the case of Doctor Who I'm in limbo between enjoying and true fanning - Type A adoration, really - but for all I love the char, I don't engage with him and the show the same way I do with SGA.
Though interestingly, most of the fans I know who do fan on Who tend to focus on particular relationships - the Rose/Ten shippers, or Doctor/Jack, or going back to old Who, I know of fans who were Fourth Doctor/Sara Jane Smith fans, pretty much exclusively. The one person hardcore into Who on my flist now writes Doctor/Master, which is one of the few permanent relationships running through the entire show (she does it permanent, too - I think she's written four different incarnations of the Doctor with the associate Masters!)
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Though interestingly, most of the fans I know who do fan on Who tend to focus on particular relationships - the Rose/Ten shippers, or Doctor/Jack, or going back to old Who, I know of fans who were Fourth Doctor/Sara Jane Smith fans, pretty much exclusively. The one person hardcore into Who on my flist now writes Doctor/Master, which is one of the few permanent relationships running through the entire show (she does it permanent, too - I think she's written four different incarnations of the Doctor with the associate Masters!)