I've got more than 3 years' experience of Rohloffs. More than 6 if you multiply the years by the number of bikes!
Weight: does a Rohloff weigh more than a big block of cogs, extra front rings, two gear changers, longer chain etc? If so, it's not by much.
Wheel removal: there are two types of connection but both are dead simple. It's also a lot simpler to get the wheel back on because you don't have to worry about getting the derailleur in the right place.
Noise: generally much quieter than derailleurs - no more chain graunching / power loss when you get in the wrong gear. Gear changing can be done either stationary or on the move, although not when under heavy pedal pressure. There's a certain amount of "meshing" noise most noticeable in 6th & 7th, but there's none in the higher gears. It gets a bit less with use, but I still get it on both bikes. The tandem has done more than 7000 miles, my solo machine more than 11000. The freewheel is quiet too.
Spoke breakages: I got a few early on at the nipple end on the solo machine, but this was down to Thorn not supplying correctly drilled rims. They use 26" wheels and the large hub/small rim diameter combination means that the spokes enter the rim at about 78°. They've cured that problem now. If you do get a spoke break, it's easy to post a new one through without even taking the wheel off.
Power loss: definitely some. I'm sure you don't notice any when you are riding but when you wheel the bike, in most gears the pedals still turn, which means that the friction is greater than that caused by the freewheel.
Dropped bars: Lee has a Rohloff / dropped bar combination and seems to have no problem.
Chain wear: my first chain was discarded at 6000 miles. I'm beginning to think about changing again now that 12000 is approaching.
The big problem we've had has been on the tandem: we've broken three Rohloffs when bits of flange have cracked. I've never had a problem on the solo bike. Thorn offer a lifetime guarantee so the only inconvenience we've had has been sending the wheel back for a rebuild. Thorn paid the postage.
Rohloffs are fantastic for touring. Mine's on a Thorn Raven Sport Tour and although the Thorn website suggest keeping loads down a bit (12kg at the back I think they mention) I've exceeded this with no problem whatever with handling and the tubes, which are a light gauge than on the Thorn Raven Tour, seem to cope very well. Since the bulk of the weight of the rear rack is supported by a really hefty stainless steel dropout, I'm not sure why they are so coy about the Sport version's luggage capacity. Then I'm no engineer.
We've twice had gear cables break on the tandem but it's a 10 minute job to replace them. To be fair both times the breakage has been at the join where the S & S couplings are. You need a torx 20 screwdriver to get into the cable housing at the changer end.
If you were thinking of going down the Thorn route, you've always go their 100-day money-back guarantee on every Rohloff equipped bike they sell. They won't do you a bike in titanium though.