Umm, kinda disagree on some of that.
If the auto zoom wasn't so bloody slow on my 720, I might use it more. As it is, it's just distracting. I do use it, but have to be very picky about when it's on and off.
Also, the ability to see surrounding landmarks (ie: lakes, etc) helps to orient you on the map. The GPS knows where you are, but I need to know also and the little arrow isn't enough. Landmarks give me that spatial presence to know where that little pointer relates to the real world..
But, then again, I fly helicopters and navigate by landmarks on maps and the Garmin 500 GPS in the dash.
GPS is great and has taken a lot of work (and divorces!) out of navigating, but I need to follow it to make sure it's doing what it's supposed to be doing.
You should never follow it "blindly"....
Well if you are talking about helicopters then I could definitely understand the need to know land marks since you are in no way tethered to a road, or anything for that matter...
Obviously I wouldnt follow it blindly (watch for one ways streets etc), but the mapping information in our devices specific to roads. Lakes, rivers, and etc arent a priority and therefore arent always that accurate. Matter of fact I'm using a 330 with 1gb internal memory and the USA/Canada map. To conserve space things like most creeks and lakes are completely removed from the map, unless they have direct involvement to driving particular roads...
The ONLY device that does not have a "modified" map is the 930's with h the North American map(this only applies to the USA obviously, you can get other countries with unmodified maps). Every other device maps have been modified to fit a 2gb storage space. This includes your 720...
I couldnt imagine a lake for example being an actual benefit to driving, assuming you are navigating a CAR to an ADDRESS and not via land marks. Even still when given directions from land marks its usually something that no GPS would have "Left at the red barn down the dirt road" "Right at the large oak tree", things that can be seen from ground level. A lake would be a pretty bad land mark from a vehicle since you have too look down on it too see it....
As far as checking accuracy is easy. You pass a road, you look to see if its on the device, yep now you know it knows you are in the right place. Lakes and ponds things that are neat too see on a map are usually unnamed unless they are very large, so how does that help you? Even if the lake, stream, pond, creek has a name it wont be labeled on any GPS device from Tomtom...
Thats just my thoughts on it. The little arrow on a road that is named correctly with cross roads that are named correctly and with curves that are correct to the road I'm driving on is as much information as I need to determine accuracy...