House of Blues is pretty good and we often eat there for lunch. Lunch is not often very crowded, at least during slower seasons when we normally visit. Pretty good variety in the menu and items you cannot easily find elsewhere at WDW; service is generally pleasant as well. Music playing in background, but we do not find it to be annoying in terms of loudness.
Planet Hollywood is okay; we have not been there since it first opened. I do remember that is was VERY loud and it was almost impossible to hold a conversation, but that may have changed. The food was okay; nothing particularly memorable except chicken coated with Captain Crunch. Lots of movie memorabilia inside and that is pretty cool.
Other places to try (there are a few new ones we have not had a chance to visit yet) - Fulton's Crab House, Raglan Road, Rainforest Cafe, Earl of Sandwich (great sandwiches on artisan bread), Wolfgang Puck Express for good pizza. Portobello used to be called Portobello Yacht Club, but it's been many years since we visited. Paradisio 37 is the newest spot along with TRex.