Can't remember name of anime movie I remember bits of this movie and I liked it.  

The mushroom shaped towers were very big, and the cybernetic being had tentacles or cords infused into its body. Just like in the pictures below...





I thought the name was willow or wind. Any help?  

Oh and this was around 20 years ago.
This is a really long shot based on the similarity to the Ghibli aesthetic mentioned above:

Could it be Tree of Palme?

https://www.animenewsnetwork.com/encyclopedia/anime.php?id=928

It's from 2002, so it's a little earlier than you specified, and I would be amazed if this was ever shown on broadcast TV. It did get a dub and a DVD release though, so who knows?

Mushroom structures - check (sorry for the angle - I couldn't find much on google images)


Girl with cables everywhere - check


woman AND boy who merge, transform into a monster and are engulfed by tentacles (it's complicated) - check



So, do any of these characters ring any bells?