convert each 11 bits to decimal
That's actually the sole purpose of this table. A human can do this without any electronic device or calculation skills.
it also becomes easy to forget your place
Maybe it's not that awkward. It's actually a process to narrow down the range.
it becomes far too easy to make a mistake
Then it doesn't really matter. A human (almostly) cannot calculate the checksum bits without electronic device. This table only helps a paranoid to cross-check, not generating.