Is it? Is finishing a project the point of the project? Or is the creative process, the journey, if you will, the point? For me it's the creative process. Most the time I couldn't care less if I "finish" a project. I enjoy creating it. Sometimes I feel sad when I declare a project finished because that means its evolution is over. The growth process for the project and for me has ended.
I work on several projects at once because sometimes I run out of creative ideas for one, but I know it's not finished. I don't know what's next, but I know there is a "next." For some people their projects speak to them. The project tells the artist what it wants next. That doesn't happen for me. Objects tell me things. I can pick up a button, a piece of polymer clay, fragment of fabric and it occurs to me that it would be perfect for that little piece I started two months ago and put aside for lack of inspiration. My projects WILL tell me when they want to be left alone; when they want to rest and be what they are for a while. At that point, I put them aside and leave them until something tells me to pick them up again.
I guess I am envious of people who can get inspiration that goes from beginning to end uninterrupted. My inspiration doesn't work like that. That's ok with me. I think I'd be frustrated if my inspiration got interrupted because I have to go to work 5 days a week. For now it comes in spurts and that suits my time to be able to create. It does, however, mean I don't finish as much as those with continuous inspiration. I'm ok with that, too. :)