Yes, there's absolutely no way to interpret Holmes' feelings for Watson as anything other than totally, 100%, without-a-sliver-of-a-doubt platonic. You can read absolutely nothing into his freakout in "Three Garridebs," or his hilariously passive-aggressive "congratulations" at the end of "Sign of Four" when Watson tells him that he's getting married. There is nothing remotely suggestive about his comment that he's "lost without [his] Boswell," or how he refers to the Baker Street apartment as "our rooms" years after Watson moves out. There is absolutely no discernible subtext in how he refers to Watson as an "ideal helpmate" in "Blanched Soldier," or how shortly after that he jokingly-but-not-really complains about how Watson "deserted [him] for a wife," or how he generally cannot shut up about his BFF despite the fact that Watson is Sir Not-Appearing-In-This-Story. Clearly, the slashers are all just frothing lunatics who are pulling slashy subtext out of thin air.

I'm glad we've cleared this up!