Sounds like you've been doing Combined knitting and purling. This is an accepted method that some people swear by, so don't kick yourself! But check out the videos on it (knit and purl pages), so you're aware of the challenges if you want to consider still doing it this way.
I just watched that episode of our Marnie on Knitty Gritty this weekend, and it looks like she knits this way! Lots of folks do.