I never used a money belt until I found this forum, and frankly, became paranoid about it. I do have a small Pacsafe bag that I use when I'm in transit, but that has everything in it. Once at my location, I switch to either a travelon or Pacsafe purse (I love their organization). Also, I split up my financial items once at my destination or not in serious transport. I leave a credit card, debit card, and a copy of my passport and paperwork in my suitcase in the hotel. In my purse I split up my items so a pickpocket would not get it all...how one would get thru the zips and catches I don't know. Basically, I make it difficult to get everything. I NEVER take my crossbody bag off, so taking the entire bag is not an easy task. My bag is close to the front of my body and I usually wear a scarf so those few motorcyclist would have to be good to grab it, but I have backup in my room.
This being said, I have used a moneybelt in the past on occasion. The first time, a waist style bag fell off in the ladies room in the very beginning of my trip. Never used that again and didn't like it anyway. The one I finally settled on, but haven't used in years, is a leg wallet that was just under my knee that felt like a knee sock, which I eventually forgot was there. That was OK, but one needs bootleg pants or loose pants and I just don't feel it is necessary anyway. For years I lived in a city and rode public transportation a lot so protecting my stuff is not new, and protecting myself from myself by losing my stuff is more what I protect against. LOL
Sometimes, for the situation, I adjust a bit. I've just pinned one of RS's belt pockets on the inside of my blazer thinking I will divide my items when going through security in London for the Eurostar. For some reason this security check makes me more nervous than the airport for sending my items through the scanner and away from me.
I believe if you know where your stuff is and keep it consistent, then there is no need for a money belt, particularly with a Travelon crossbody bag. If you are one of those people who takes off their bag or leaves it open, then wear a money belt. Otherwise, after 50 years of travel (I can't believe I can say that), you don't need a money belt. Just divide, secure and be consistent, and keep your bag on. Even Rick Steves admits he was stupid when he was pick pocketed and didn't follow his rules because he had all his items in his wallet in his back pocket.