At least on this occasion the maitenance crew could see that the ejection went as planned.
One of the longest waits you can have is when you have carried out some maintenance on a seat, and on the first trip afterwards the aircraft goes in.
If it is somewhere in the fastnesses of Wales or Scotland it can be a few hours before you hear whether the crew got out OK, and in the meantime people are all trying to be terribly nice to you, without getting too friendly, if you know what I mean.
There are some facilities for using one using compressed air, which simply goes up the rail and stops, and is then let down under control.
The risk of injury is so high, around 90%+, that you could not possibly risk the loss of a front line pilot.
As a matter of interest, ditching is a lot more hazardous than a normal ejection (though ditching technically refers to actually putting the whole aircraft, not just yourself, down on the water), since the normal, and they are normal. back injuries make it very difficult to get into the dinghy.