I would not see a problem with taking a bride there at 5 other than just a lot of traffic driving through the area, most restraunts will be open and a couple of the bars but the Clubs will be closed pretty much and you won't see much walking traffic other than people coming home to walk their dogs.
Now a lot of the "tag" art no longer exists but there are still a lot of "art" backdrops out there-you can go to this album and see a lot that I shot earlier this year.
http://www.pbase.com/pgkps/random_dallas_shots&page=all
Everything past the devil should still be there, now the guitar player and the Erika Badu are both about 6 ft off the ground on the same wall and a few shots are over in Exposition Park by Fair Park. If you need more specifics on where something is exactly tell me what pic and I will try to tell you where it is.
The works painted on the concrete slabs/shapes are all under the I-45 overhead near the dog park and most of them are actually under cover of the brige.
Now this album does not cover any of the Goodlattimer Bridge Art since it is all gone now anyway thanks to DART.