I've found three ancient roots within 2 minutes from one another (another one 15 minutes from those three), an ice spire right beside an abyss, another ice spire less than 10 minutes from an alt's spawn, and I've lost count how many water springs I've seen. I've seen more water springs than king's oaks.
Could you reduce them significantly for the next world? Or at least cycle them around randomly as suggested before?