Like most brewers in the UK I use a 5(imp) gallon FV or 5-6(imp) gallon cask as a secondary, or clearing vessel to be more accurate, both are fitted with taps/faucets. The back of the tap can be fitted with a rolled up piece of stainless steel gauze (extracted from a frying pan spatter guard).
If whole hops are used, transfer to a bottling bucket or keg can be done as normal by fitting a poly tube to the tap (to avoid splashing) and opening the tap. Straining is done automaticaly.
If youre using a 6 usg carboy, copper wire a stainless scrubby on the end of your racking cane. In my experience whole hops float so flow should be normal right up until the last few pints.
Alternatively, if using a 6 gal FV, simply lift the lid and scoop up the whole hops with a strainer.
I dont think hop bags are necessary, just one more thing to clean.
No need to sanitize hops though, they contain a mild anti-septic and were used as a preservative as well as flavoring originaly.