Suggestion: when you need to do brakes again, use Wagner Ceramic pads. I bought a used Journey that needed brakes on the rear (84,000mi). It appeared that the pads had been changed on the front, probably similar to your issue, but they hadn't replaced the rotors and they were below minimum thickness. I first replaced the rear pads and rotors using Wagner ceramic (cost more than the typical OEM equiv), and using Wearever (Advance Auto) rotors. I have almost 6,000 miles on these and can still detect machining marks on the rotors. Obviously the rear should not wear as quickly. I was so pleased with these that about 2,000 miles ago I did the same for the front and they still show the machining marks. Both front and rear are original calipers, pins, boots; lubed with special brake grease. Pad guides are new, included with pads, and they were greased as well.
I have not driven it long enough to determine if they will exceed the 20K/40K that you relate, but the way these are after the use they are getting (mostly city miles), I am hopeful they will greatly exceed your experience.
About the timing belt replacement - your experience on the Charger provides me with a glimmer of hope. I do almost all of my own mechanical work, but I am concerned about changing the belt on the Journey because the engine is transverse, where in your Charger it faces forward. The timing belt cover on the Journey 3.5L is up against the right strut tower and the engine mount is in the center of of the "loop". So far I can't find any repair/installation directions for the Journey. (Mopar has a service manual, but it only works on Windows 7 and earlier with Internet Explorer - I am 100% Apple)
If anybody reads this and has instructions, service manual for the 3.5L engine in the Journey - I'm up for making a deal.