Respectfully, the guy you spoke to on the Apple Store is wrong. There might be a lot of same functionality with a similar form factor, but with the added GPS, LTE, much faster dual core processor, larger storage, brighter display, 50 m water resistance, audible Siri are all huge improvements to make the Apple Watch a well rounded experience.
However, in order to justify the price point, one would need to appreciate those features.
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Disagree. I think the rectangular design is more contemporary and modern looking when compared to a lot of watches today. I think Apple did a really good job here with the design between Marc Newson and Jonny Ive. The main complaint is the thickness of the Apple Watch, which I also don't have an issue with.
One thing you have to understand About Watches, it's not often the casing actually changes physically a lot over the years. Generally watches retain their current form factor as it is, but in the case of the Apple Watch, it might see some subtle changes physically if there is a Series 4 in 2018.