OK, Silver says I've been quiet on this long enough...since I'm a risk manager (among other things) for a community bank.
First, insurance requirements are a legitimate concern for any business. The rant needs to be directed at the insurer, not the business. If there's a business that does allow bikes, it is because of the employee's ignorance of the insurance requirements...and this too will change after an accident.
Second, at my bank - which has the largest market share in our core market - we provide bike racks at our branches and walk up facilities at our drive throughs. We would also have no objection to someone bringing a bike in...shoot, we have a bag lady customer that brings her shopping cart in...
Third, for those who have good experience with riding/walking up to drive throughs, that's great. But, I for one believe that it is more risky because you have vehicles in tight density. Not that I wouldn't do it if there wasn't a lot of traffic...but the business has to manage to the lowest common denominator...serious back-ups, impatient customers, and a driver's foot slips off the brake pedal... Drive through accidents are not uncommon, but you don't hear about them because vehicle to vehicle contact is at slow speed with no damage...but vehicle to bike contact is serious even at slow speed...
My 2 cents...
If you don't grow where you're planted, you'll never BLOOM - Will Rogers