I get it on mine (200 Mac Pro to iOS on 7.0.2 on 4s). Go into your Mac and turn off iCloud sync and do the same in your iOS device. Then wait 10 minutes and go back in both the Mac and iPhone and turn back on iCloud sync again. Re syncing this way seems to help.
I think OP is looking for a single window solution. Prior to ML, you would view reminders in the iCal app, however ML divided this into the Calendar app and the Reminders app.
As far as I know there is no way to merge the two apps into one window.
BusyCal looks like a great 3rd party app that offers a similar layout you're looking for and should sync with the native built apps as it claims full iCloud support. You can see in their see screenshots that the ToDo list shows up to the right of the main Calendar. They have a free trial on their site.
I just dug up this old discussion while searching for how to get reminders/to-dos on iCal. The bottom line is that you still cannot do it. But BusyCal is still going strong, still offering a free 30-day trial, and is still AWESOME! I just installed it and will use it as my default calendar app in place of iCal.