Life should change. Mine certainly did. I still went out every other weekend right enough, but that saved my sanity.
My twins didn't sleep. They screamed. A lot. When one was asleep the other was screaming. It was like being tag teamed. I was depressed at my failings - I couldn't settle them (though turns out there were actual reasons for that), I couldn't BF them because of my own medication and my relationship with their father had gone to shit so they had a broken home.
For the first 7/8 months of their lives I lived for every other Friday when my amazing SIL would swoop in and take them away. I could heat hot food, sleep, and go out with my friend and feel like a human. It gave me the boost I needed for Saturday night when they came back and the fortnight started over again.
People might judge me, but that "abandoning" of them, from around 8 weeks old, has made me a much better parent. Without it I fear what would have become of the three of us.
Mine all still stay with family at the weekend. MIL and FIL are gutted (although hidden from the kids) when they've got something on that precludes them staying over on a Saturday.
I believe it firmly benefits them as well. When I broke my leg none of them batted an eyelid about being collected and staying over with PIL or SIL. They have a strong, individual, relationship with each of them and the benefits of that are fantastic.
One of my DD's used to cry when I collected her from SIL's. They had a sandpit better than ours. My nephew used to do the same to SIL when he stayed at my house because we had a fish tank. It doesn't reflect badly at all on our parenting imo, I can't imagine why anyone would think it would!