You are not alone in your thinking! My daughter was the same way. She slept great in the swing. I could never move her once she was asleep (if holding her, I could not lay her down w/o her waking up...). I let her nap in the swing and she took great naps. My hubby refused to let her sleep in the swing at night, saying it would become a habit and she would never sleep on her own.
Because of that, I was up with her every 1 1/2 hours until she was a year old. She would wake up 3 or 4 nights a week and "be up" for an hour or 2. It was horrible! On nights he was gone, I let her sleep in the swing and she did great. I eventually started cosleeping with her (and LOVED it) and it led me to cosleep from the start with my son. I don't know if I would have done this had she slept in the swing.
My eye doc told me I did this to her by not letting her figure it out, but I think there are babies who just don't sleep well on their own. Look at askdrsears.com or look up some of Dr. Sears baby books about high needs kids. It doesn't mean they have a disability, they are just more needy. He also sells a sleeper for kids like this. His son is the pediatrician on The Doctors tv show.
My dd is now 3 1/2 and sleeps in her own bed all night long, so I think people who say you spoil your kids early make them have problems for life are full of it.
I feel like I'm rambling, and I'm sorry for that. I just had a similar experience as a first time mom. Good luck!