in terms of "sound fields" to use, unlike your Yamaha the Denon receivers are really focused on the "straight" decoding of sources and playing them accurately as recorded. Yamaha's will sometimes actually sound better using one of the proprietary sound fields, Yamaha really is focused on creating cool and usable surround fields with extra DSP processing.
On the other hand, Denon's DSP modes (accessed with the "SIMU" button) are pretty much horrible, and should generally be avoided.
For the vast majority of material, you will want the "Standard" decoding mode (accessed with the "STD" button at the bottom of your remote). The "Standard" mode will put your receiver in the default decoding mode for the input signal you are receiving.
For example, if you are receiving a 5.1 Dolby Digital signal, you will see "DOLBY DIGITAL". If you are getting DTS, it will say "DTS". If you are receiving TrueHD, it will say "DOLBY TrueHD", and so forth.
So, basically, for any MULTICHANNEL input just stick to the "Standard" mode and you are good to go. MultEQ + Dynamic EQ + Dynamic Volume will take care of the rest.
For any TWO CHANNEL input, you have your choice of listening to it in straight stereo or direct mode ("D/ST" button) or matrixing it to multichannel using the "Cinema" or "Music" buttons. I explain this stuff pretty well in the FAQ.