Klaus
First Post
It certainly is. However, too much information provided can actually increase the amount of time it takes a DM to complete his/her prep-work. It might only take me five minutes to come up with some notes on how to join the Knights of the Hart or fifteen minutes to dig out the source book, look up and read through the information provided, and then determine how it relates to the specific situation the PCs are in. That's not a decrease in my prep work; it's an increase!
I learned this lesson a few years ago as I prepped a Forgotten Realms campaign set in-and-around Silverymoon. The time spent reading and rereading through the 3.0 Forgotten Realms Campaign Setting (~300 pages excluding the index) and the Silver Marches Campaign Accessory (~150 pages excluding the index) was rather significant. It should me just how ingenious the Greyhawk Folio and boxed set were! Enough information to inspire me and whet my appetite, without being so onerous to get through.
Most FR presentations go the opposite direction for me: too much detail of every little thing. There's a lot of room for a balanced approach between those two extremes.