Fman,
What a good question. When I am with my outdoor plants, I find the hours I spend, are very spiritually uplifting and very enjoyable. I guess the anticipation of the flowers arriving is the motivation, and the first deep breath of the fall aromas. The indoor grows are pretty much all business, I check the room twice a day and water/fert as needed. I do get stoned to the be-Jesus once in a while, and just stair and observe growth and stuff.