I never use a hose to wash my bike , so using a leaf blower would not be needed.
I think spraying water all over your bike is not good for it. There are many parts that really do not need to get wet, like the seat, all of the electrical conneections and air box.
Some folks say they are "lazy" and do not wash the bike, but to me spraying it with a hose is the lazy mans way to wash it.
I remove the seat, put the bike on the centerstand and using an aray of glass cleaner , Honda polish, brake cleaner , contact cleaner, a sprayer filled with a bit of dish soap and distilled water, a roll paper towels and some cotton ones...I go over every single part of the bike and wash it seperately.
If the wheels are real dirty, I will use a pan of soapy water, but will raise the wheel off the ground and sit down to clean them from the spokes working out...I even wash the tire off.
After washing every part I then wax anything that needs it, and clean the seat with a vinyl - leather cleaner.
Granted I do not do this too often, but I can understand washing the car with a bucket and a hose..it has alot of surface area. But bikes are so small, it just seems half-assed to use one soapy rag and a hose, much less spraying all those areas that do not need water on them.
By washing each part seperately, you still get the chance to "go over" the bike, likely better as you are concentrating on one area at a time. Washing the tires gives you a good chance to check for rocks , nails , etc.
The big adavantage for me is I can do this in my garage when the weather is crappy, and save those nice days to ride. When I was younger and did not have a garage, I would bring it inside.
If you prefer not to clean the bike often, it is always a good idea to go over it to check for loose bolts, nuts, worn parts , etc. Washing your bike should not be the "excuse" to do this, you should be doing this on a regualar basis anyway..washing or not.
Dirt bikes caked with mud would call for a hose, but streetbikes call for cleaning products, and attention to detail. You don't have to be as anal as me, but put down the hose and take the time now and then.