Well, every baby is different, so no one's story will help you predict your own future. But... my now 4.5 year old was a HORRIBLE sleeper from birth until, well, just a few months ago!. We tried almost everything to help him, and nothing worked but time and patience (and lots and lots of coffee- for me, not him ) Now he sleeps ok-ish, waking "only" 2-3 times for brief reassurance and a snuggle.
My daughter is now 14 months old. We didn't parent her differently. I was there to sleep next to her and nurse her as often as she needed it at night, just like my son. But, she's already slept through the night in her brief life probably 5 times as often as my son has in 4.5 years. Except for a few short periods around key milestones early on, we were always getting solid 4+ hour chunks of sleep practically from birth. It was/is just her temperament. I nurse her and lay her down drowsy for a nap, and she sleeps quietly for 2-3 hours every time. My son needed someone to lay with him to fall asleep, even as a preschooler, then slept for 45 minutes at most before needing to nurse and cuddle again.
We co-slept for a long, long time with my son, since that was the only way to get any semblance of rest. We planned to co-sleep for a long period with my daughter too, but at about 10 months she started getting super restless at night. We tried laying her in her own bed in a different room, and she took right to it, sleeping soundly right away. If she wakes at all at night, it's for a quick diaper change, a 5-minute nurse, and then she's back off to sleep without a peep. My son needs people nearby to sleep. My daughter seems distracted if others are around, and now sleeps better alone. Two kids, two personalities, two sets of needs.
I hope for your sake that your child-to-be gives you an easier time. And if he does, you'll know how much to appreciate each easy nap or bedtime! I'm still in awe every time I lay my daughter down for sleep knowing that I have several quiet hours ahead of me. I never had any free time during my son's naps because he kept waking and needing help to fall asleep again!
It's healing to me in a way, because I can see now that it wasn't attachment parenting or co-sleeping that "made" my son the sleeper he was. I did the same things with my daughter, and I got a completely different result.