There are a million different ways you could implement a "one click checkout" yet the USPTO granted a "one click checkout" patent to Amazon. And countless similar parents exist today. (podcast patent, online shopping cart patent, a patent on making 'toast' and on and on)
Plus, a lot of those software patents are not valid[0]. The validity of software patents in general and what qualifies as patentable with regards to software is still an open question.
How about where the line's even thinner - Amazon's infamous 'one click purchase' 'algorithm' - which they managed to patent - would you call that an 'idea'? An 'implementation'? A 'process'?
I think anything, including ideas can be patented - and if Google is trying to go by the spirit of the law rather than being Pharisaic about it, they need to cut this guy in for a percentage of the patent of his idea, rather than shafting him because they can.
The distinction does not make sense.