There are a number of reasons for using pocket doors in your home. Some of the reasons are included here:

1.  Pocket doors require less space to use, since they slide into a recessed space
in  your wall.  With each pocket door used, you can gain up to 15 feet in usable space in a home, since you can use all your wall space.  Using 10 pocket doors could give you up to 150 square feet in usable space.  The more limited your space, the more you would notice the added space.

2.  Using pocket doors in your home allows you greater access through doorways for handicapped access, and also other uses such as moving furniture more easily through your home.

3.  Since pocket doors are hidden completely out of the way when opened, they allow a room to be closed off completely, yet completely opened when the doors are open.  When using double pocket doors, this comes even more into play. 

4. French doors with glass used as pocket doors, are the perfect answer to a room where you want it closed off for certain purposes, but also want to room to be light.
The doors will block sound, without blocking the light.

5.  Any type of door can be used as a pocket door, whether they are raised or flat panel doors, v-groove doors, or our glass french doors.  With the appropriate hardware, you can just close a door with no lock, using a passage pocket door pull, lock a door lightly with a privacy pocket door pull, or for secure locking, with a key, use keyed pocket door locks.