Missed the first series due to living abroad at the time.
Watched it from series 2 onwards but was not as avid a viewer as now - didn't mind if I missed an episode etc.
Missed all but the final of series 8, again due to being abroad. Caught up on some of the best moments of that series on YouTube, though, after my mum raved about it!
Series 9 was when I started to really get into it, haven't missed an episode since then I don't think and will always catch up if I'm out on a Saturday evening.
It's my mum's favourite show too so we often talk after the show and discuss our thoughts. She loves that I've become as big a fan as her!