I meant I would go away and stop hectoring you and leave you to make your own mind up
I'm not going anywhere really, I've procrastinated all day and see no reason why I should stop now!
I actually know a lot about this because I grew up in HK and we lived through the mass cull of birds from bird flu and the fear of SARS and learned about virus protection at school.
Hand sanitizers are worth using because they're effective for bacteria and some viruses. However you have to recognise their limitations - they're only effective in proportion to the alcohol concentration in them, ideally as much as possible. The highest concentrations are usually available only in a hospital environment - Purell, for example, is only 65% alcohol. That won't help with most viruses like the common cold (rhinovirus) and flu.
The other thing is that hand sanitizers work against things that are able to live on your hands (like bacteria and viruses that have an outer envelope) but many viruses survive only minutes on your skin but much longer on other surfaces, eg. clothes so unless you're changing into sterile clothes as well like a surgeon does, wearing gloves and a mask like we do in Asia when on public transport, etc, hand sanitizer won't do much to reduce your risk of infection from viruses like flu, norovirus etc.
The best thing is really to get the jab - the research has been done, controlled trials show it works. The second best thing is to wear a mask and gloves on public transport but people really look at you funny if you do that in the UK - luckily they don't in Asia!! And finally, the last thing is to wash your hands regularly and thoroughly with soap rubbing with your fingers interlaced and under your nails (just like on TV!), use a hand sanitizer for bacteria and the proportion of viruses it does help with, and don't touch your eyes, nose and mouth if you can avoid it. And move as far away from someone coughing or who looks ill if at all possible.
So anyway, talk to your doc if you're concerned - I actually initially put a comment about being shocked at what your MW said too but deleted it to avoid offending you in case you agreed with your MW!!