I think the point is inflation increases the money supply, while debt remains the same. Individuals make more money with less buying power, but can pay off debt easier.
Well that's good for people with debts. It's bad for people without debts and those who loaned them money. Debtors are basically paying off their debts more easily at the expense of all the others (even those who are not involved in the deal of loaning).
In the mean time the average real salary has been dropping since 1969, because of inflation, and because the government and companies didn't bother to increase the minimum and average wages to keep pace with the inflation.
So I really doubt most of the population benefits from inflation.