CWS
CWS useful for me in 2 ways....
When deviating around minor patches of weather. Leave AP in CMD and de-select LNAV/HDG and move the aircraft where you want in roll. Remains in CMD in the pitch mode so you won't deviate from the assigned alt.
De-selecting LVL CHNG/VS in climb and descent (again A/P in CMD) then pitch up/down for whatever you want. Autopilot will still acquire the altitude selected in the MCP so again no level busts. Useful for bunting over/under weather/traffic.
Using the CWS mode completely...Why? We are pilots, fly it!