I'll tell you something.
My experience.... As my son got older, the easier it was to have a relationship. I work a lot and attend school, my husband works a lot aswell and we always find ways to cuddle when the baby is sleeping. Things like going out to eat and such the baby usually comes with us. He's a really good baby too so that probably makes things a lot easier on us.
But I promise, it gets so much easier when they get older. Things may seem so crappy right now but if you just make it through this rough time things will eventually get better with time.
My husband and I also do things as a team. When the baby needs changed, we both go upstairs and do it as a team (unless hes at work) we give him a bath together and I think being a team when you have a baby makes a relationship a lot closer, so no one feels left out of anything.
I'm just rambling but I hope I helped anyways lol.