To be fair, in the pen-/ultimate year/s people begin to panic about post-grad life and spend pretty much all their time doing apps. The only reason they can afford to do this is ... well, panic. But also because they've developed time-management skills and optimised their study experience. After you have this down, you could use the remainder of your time doing apps or sleeping; it's up to the OP.
Also you do get used to being busy non-stop. After a while you are stressed out by peace and quiet.
Also John studies at LSE, so take his "we lowly non-Oxbridge people are not inundated with work" with a pinch of salt.