Are floor tickets worth it?
Floor seats are always better. That's why they sell out first. The biggest fans are usually on the floor and the energy is contagious. However, I've had wonderful experiences both on the floor and in balcony sections. It also depends on the venue.
I had a somewhat bad experience with floor seats. My wife and I went to see Trans-Siberian Orchestra and we shelled out for the floor seats. I don't know if it was the height of the stage or what, but it was really hard to see sometimes. I'm 6' and even I had trouble seeing over everyone in front of me. All that said though, it was still fun. We were more involved in all the neat theatrics of the show and felt a lot closer to the action. I would still say it was worth it though because once the show really got going the performers were all over the place so you get some good views.
I've been to a few concerts where they offered floor + seats, and I always had a seat. Which is fine, if you get a close spot. But then I've been to some that are floor only, and I honestly like that much more. You can see fine, unless someone really tall stands in front of you, on whic case you can just move over. It's a much better experience overall, and a lot more fun :)
If you aren't in the first 12 rows it gets pretty tough to see.