I don't know if I've ever been "in love", per se, but I have had very strong emotional attachments to people.
Usually when I like someone, it can start as admiration. I admire their mind, or personality, or their kindness. Then when I get to know them I have feelings for them on an emotional level.
I don't usually have any physical feelings towards a person unless I've known them for awhile, I really like them and am comfortable around them, and they have shown some interest in being physical. Then I might develop an attraction for them, although it's still not as strong as my other feelings. Attraction is definitely the least important part of "love" for me.
Although, sometimes I'll find I'm attracted to someone I don't know, though that usually fizzles away unless they have a personality to match their looks.