No, not yet. Only in so much as I opened a blank plot just to test all the new stuff before actually starting a proper build. As such I placed the hedge, the running track, etc, just to see what they looked like, but haven't actually used them properly yet.
I tend not to go for exterior beautification (I don't think I'm good enough) so I'm not sure about hedge mazes, I hadn't thought of that until you mentioned it here.
One thing I DO tend to do is make an outdoor complex, lots of separate buildings linked by pathways 3 tiles wide, and I have to say I really like the new sandstone for that.
(Oh and incidentally, I'd never played the Harry Potter games for PS3, but after picking up Harry for Lego Dimensions, I got the Remastered Collection last week and am very impressed. Nice job )