It does excite me, but only as an achievement in its own right. Younger people may start to think that GB Olympics performance was ever like this, not recalling the dark days of one gold in Atlanta, and earlier games where we wildly celebrated the odd bronze. So I'm not going to knock those achievements, BUT (and it's a big BUT), the ugly word of "legacy" needs to be addressed.
The only beneficiary, apart from subsequent medal winners, of this huge sporting investment I can think of is West Ham. As far as I can see, there seems to be very little knock on effect in motivating the nation to do sport. Basically this focus on elite athletes couldn't be further from the old slogan from the 80s "Sport For All". While our medal tally has increased spectacularly, so has for example, obesity. I don't mind investment in the elite athletes providing there is similar (greater) investment in grass roots. We seem to be able to identify the best people already doing a sport, but surely it's more important to get people doing the sport in the first place. And that involves building facilities that are accessible, and making them free or reasonably priced to use, and training a huge number of new coaches. It certainly doesn't involve selling off green spaces and school playing fields!
Perhaps this is not done because it's a lot more expensive than producing gold medal winners and perhaps isn't so easily measurable (and don't get me started on the modern trend of 'if it isn't measurable it has no value'). The government can easily say it's sporting policies are working (not that it's directly to do with the government) as long as we are being so successful. But I would argue that investment in sport brings extra employment for coaches and construction, a healthier population with associated savings on the NHS budget etc and (very) generally that healthier people are happier people, which may have other beneficial effects. But in the long term the success of the elite athletes might in fact work against the physical and health of the general population. In reality these facilities are quite hard to find and sporting activities will always be cut from the school timetable under academic pressure.