To answer the question. A fair bit, but not as much as I would like. Its a beautiful place.
Not fished from the bank much down the west side, but if it's like the other sides, I don't think you will struggle to find access.
As you say, its a vast water and a boat will give you good access and mobility.
Down the west side Dalavich is the place for boat hire and fishing permits if you need them. Not been there for a few years but it used to be run by a chap called John who was a good source for up to date fishing info. They also do tickets for Loch Avich which can be good for bownies from the bank early season.
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjJgf6qid3TAhUFLsAKHZsdBbUQFggmMAA&url=http%3A%2F%2Flochaweside-marine.co.uk%2Fconditions.html&usg=AFQjCNHc335xcC83CaAKL0as4rcjVZfqyw
ps. There is a loch called Tromlee north of there near Kilchrenan that should produce plenty small jacks to young spinning roders from the bank.