Why I personally use a Cabana.
1. For a nice long private shower.
2. For the phoning the office or conference call where you can shout all you like at the phone and not disturb fellow pax - and a local call.
3. Recline for a bit to get over the stress of security queue

Other uses for a cabana
4. Sleep or a shag would be the third but never tried either.
5. Avoid children or loud conversations by other pax
6. Watch a tele programme of your choice since you control the remote

I much prefer the cabana at the CX First lounge in HKG. It feels more open and tranquil with the indoor patio area at the end of the cabana.