When I truly don't want to get distracted from what I'm doing (read: stop cleaning to sit down and watch the show) I go with series that I've seen before but not in a while. Shows with multiple seasons are great so you can just pick up where you left off - Star Trek (several to choose from), GBBO, MacGyver (the original), classic sitcoms (I Love Lucy, Mary Tyler Moore, etc.) MASH, Remington Steele, Hart to Hart, Golden Girls. More current shows I like are usually crime dramas so they may not be what you have in mind - NCIS, Blue Bloods, SWAT etc.
If you haven't taken some time to rate what you like (and don't like) on Netflix you should try that. If you give them enough info in rating your choices their recommendations are usually spot on.