English has about 1 bit per character of entropy so if you type a normal expression it is going to give you ~60 bits of entropy. Random words will give you something like 2-3 bits per character so ~120-180 bits for a 60 character string. Random alphanumeric strings have about 5.95 bits of entropy so you get 178 bits from 30 of them.

So your comparison is somewhat right but only with an annoying definition of haiku and dictionary of words. However, a less good scheme should still be fine