UAL_Rulz:
WT+ is a totally separate product and you really cannot compare it to E+ on UA. Whilst you do get an economy meal, it is a separate cabin with totally different seats. NB: It is NOT a quasi-business class. Think to your self it is an improved economy class and you'll enjoy it more.
UA just moves the rows a bit farther apart. If you really want an E+ seat, there is nothing stopping you from moving to an empty seat.
If you do that on BA, and move yourself to WT+ from WT-, the CSD will apear with a hairbrush, a stern look, and send you packing to the back of the bus where you belong