I only operate a 10 foot plank, but I love the flexibility of DCC . Being able to put any loco anywhere, at any time, is much better than the alternative.
Wiring can be as easy or hard as you want. I isolate every siding and feed to them individually, to ensure electric continuity, but if I relied on fishplates I'd have only about three feeds. Dead easy.
I use gaugemaster prodigy - it's easy to used, with good customer support. I used before this a Bachmann basic set up controlling up to 10 locos ( can't rmember what it's called ) and that was about £50 and good enough for first couple of years.
I'm still undecided about DCC. Sound. I'm not sure I'd want a whole fleet with it, and I'm not sure it's worth doubling the cost of each loco. I did have a sound 66, and that was, er....irritating....