I am an Eagle Scout, and I do feel that it has made a significant impact on my life.
It definitely opened doors for me in college, and I think it helped secure some scholarship offers from certain schools (which I turned down, because dammit, I'm a Buckeye!).
When I left the Ohio EPA and interviewed with several big law firms, even though I felt like I had some significant academic accolades and some laudable work experience, I received more positive feedback and comments on achieving Eagle than anything else on my resume. This came as a bit of a shock, to be honest, but it definitely helped me gain some perspective on the value of a young person being able to stick with something (and something of a positive/service-oriented nature) and see it through to completion.
More importantly, though, I definitely feel that the sense of helping others, being a good friend/citizen, honoring your God and your country, and just basically "doing a good turn" is something that has stuck with me throughout my life. I'm not saying that I'm always doing the right thing, or that I'm living my life on the straight and narrow - I've been an idiot and a jerk on far too many occasions. But there's a voice inside my head that reminds me from time to time that I am an Eagle Scout, and this makes me think of priorities in life, and the value of doing by and large "good things." It sounds corny, but it's true. I think that becoming an Eagle Scout at 15-16 has helped me to "be a better me" throughout the rest of my life.
What's really special to me is that my son is now in Boy Scouts, and he often remarks that his dad is an Eagle, and that he's hoping to reach that rank, himself.
For my Eagle project, I asked our local city beautification committee if they had any projects needing attention, and I ended up picking an old, abandoned, very run down parking lot near our flood wall, just to one side of the busiest bridge in town. No one parked there, anymore, and it was a definite eyesore. I got the city to bust up and haul away the old asphalt, I got a topsoil company to truck in a bunch of dirt (which ended up being pretty poor stuff, and we had to rake rocks out of it for days). We planted a number of trees (mostly small, flowering types) and shrubs, installed a stone walking path for the fishermen who traverse the parcel, and planted grass. I also organized a group of local business people to water the trees/bushes/grass and care for it after I was done, and even got a local service club to adopt it. Almost 30 years later, it still looks pretty good!
I commend you for heading down the path to Eagle, and I wish you all the best in finishing things up!