Is the extra two feet worth it or needed? Can you do a decent layout
within
11 feet?

Repeating others:

More is better.
Depends on your use.

Thatt said, I view shop layout as a series of "lanes".

Feeding a board into a table (ripping) defines a lane for infeed and outfeed
from the saw. If you cross cut at a table saw you have "so much" space for a
longish board to extend beyond either wing of the saw. This too defines a
lane.

Lanes exist for all all machines even if the workpiece remain stationary
i.e. the area left and right if a chop saw.

Each machine has a "lane" and you need to decide what is the biggest
workpiece you want to accomodate. As previously alluded to, the 4x8 sheet of
plywood is one of the workpieces that you may want to accomodate.

Lanes and be stacked vertically. Machines can share lanes. Lanes can be
temporarily extended with an open door. Machines can be placed on mobile
bases to make you lanes dynamic. Assembly counts too; you are the machine.

Storage is important, but secondary to the "lanes". Storage should be fit
under/over/between the lanes.

What machines do you plan to have? What size workpieces do you wich to
accomodate? That should drive your shop size and layout.

Good luck.

-Steve