My e-bike was so ridiculously expensive that I feel very reluctant to leave it locked up where I can't see it. If I want to do that, I use my Thorn. OK, that was very expensive when I bought it 16 years ago, but I figure that a bike that's done 42,000 miles doesn't owe me a lot, even though I think it's easily got another 42,000 miles within it.
The situation hasn't arisen yet but I see problems trying to take my e-bike on a train. I understand that some rail companies stipulate a weight limit of 25kg and mine is probably marginally above that even with the battery taken out. Also, it has very fat mountain bike style tyres so a dangly bike space would be a massive issue. I would still like to tour Scotland with a tent. I would probably need to use my Thorn for rides like that, but limit myself to about 30 miles a day if I had a lot of climbing.
I've found some interesting aspects of e-bike riding I didn't expect. The assist gets you up to about 15mph before it cuts out, but I've found that if there's a tail wind, getting all that mass shifting along at 20mph or so isn't that hard. I've done that a few times on the sea front.