|June 15th, 2015
When I first started doing this I would screw up sometimes or pause very slightly before saying a word starting with 'w' or 'wh'. Over time consulting my sense of spelling has gotten completely automatic, however, and ten years later I just don't notice anymore.
(The alternate explanation would be that in this time I've just learned new pronunciations for all the common w/wh words, and haven't actually made any connection between spelling and pronunciation. The way to test this would be for someone to put me in a situation to elicit uncommon words like "wintle," "weevil," or "whizgig" without letting me know what was happening, letting me see them written, or giving me time to think.)