I went on the Warner Bros. tour quite sometime ago and I'm sure it's changed. At that time, there was an age requirement.
I'd say go for it if it was 2 adults and true movie/film type buffs but kids might want more of a ride type setting.
When we went, some of it was walking which was nice as we got to go into the actual sets that had just finished filming. (actual sets, not some that have been there forever for a tour).
It was a tour of about 15 people only, we got to walk down the streets and peek inside the fake facades instead of riding by. We also came upon a couple of tv shows that were filming and saw a couple of the actors coming out of the makeup trailers, another group was out eating at a catering type table.
We went inside a studio and watched behind glass how they record the music and sound effects for cartoons.
I'm sure this doesn't happen any longer but they just let us go in the middle by a cafe type place where people in the studio would go for lunch. We were free to stay and eat or go.
On the other thread you asked about Universal. I agree with the others, I think 1 day is plenty. Beverly Garlands Holiday Inn does have a shuttle btw. We had the VIP passes which we ordered online as we went during a holiday. It was very nice. We didn't have to wait in a line for a show but walked up 2 minutes before and went into another area. Very useful for Jurassic Park. I don't know if the VIP passes are different from the head of the line passes but we had head of the line twice for each ride. Sometimes they punched the card, sometimes they didn't to show how many times it had been used for that ride. We were ok with that since 2 times is alright if you have one day in the park.