Some great advice, I especially like the "saying it out loud" thing. I think that would shame me into riding quite well. Oddly, I am already doing quite a few things that were suggested. Car keys and motorcycle keys on separate keyrings from my house and bicycle lock keys. I have a two bike, floor to ceiling stand in my kitchen by the front door so I have to walk past the bikes on the way out the door.
Last night, after a long day of work and going to the gym, I rode to my daughter's school musical. I met her mother (my ex) there and she said "did you ride your bike?! You're so weird!" I knew in advance that it would bug her.
After the performance I walked past all the crammed in cars waiting to leave the parking lot, including hers, and cycled quietly away with a huge grin on my face. That in itself was priceless.
Sometimes it's the little things that keep you motivated.