A question for the blender people

I wanted to fix some stuff in my mesh so deleted a smaller part of it and now I want to fill that hole again.
The thing is, I was pretty much done with the whole model with textures, UVs and all.

I thought deleting some faces and filling the hole wouldn't be a bigger problem but apparently it isn't as easy as I thought.

Do I really have to do the whole UV AGAIN just for a handful of changed polygons?