I’m trying to determine if this is satire or not. I’ll respond anyways if it is just to share a point of view for anybody else reading though.
EDIT: I just saw the username and saw you commented above. The below still stands for everything the average big truck American embodies though.
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Besides the fact you have an oversized, $30,000+ vehicle for just grocery shopping (as you say “so you get some use out of it”), the ideal walkable/bikable city will save you time plus has the added benefit of making you healthier too. The exercise you get and reduced air pollution will have a noticeable affect on health and lifespan.
As for time saving, you say you spend ~40 minutes traveling to the big box store, but a walkable city would have more stores closer to you so you could just take a short 10 minute walk or 4 minute bike ride to them.
The umbrella and bag situation is an easy fix though, just spend like $100 on raincoat, backpack, etc.; you didn’t mind spending $30,000 on a truck. I know some people need a vehicle for longer travel, but that’s the point people are trying to make. Having every American require a multi-thousand dollar more of transportation when $500 for a bike and equipment is just insane.