Its a matter of what you have installed and the hardware ability
The landclass, season.bgl, scenery, etc all play a part in what you see or do not see
This is with UTX and Cloud9 landclass enabled
This is without UTX and cloud9
Which is inaccurate for the location because the default LC does not place the clearings and roads where they belong and OVER draws trees. The default landclass also does not render the alpine tree line correctly in the mountains making many of them them too rocky at lower elevation when viewed up close
This is without UTX or Cloud9
This is with UTX and cloud9
Which is pretty dang close for the money. The default is too concrete and does not display the veg in the area correctly. Urban/city areasl ike trees, are OVER drawn in default. The better product redefine the layout so it has a better representation of the area from the air.
There will be things you like and dislike about any add on because they will never be 100% accurate, and, some can make autogen dissapear where the default packs it on. I prefer a more defined world. The default landclass and other areas which generate autogen buildings and trees is very poor and inaccurate im most of the world, especially shorelines however the source data used was not that high quality so it is natural the result will be iffy.
Even the payware add-ons are not 100% accurate or anywhere near close. To get that type of accuracy requires data that would cost the scenery builder several hundred thousand dollars per sector of world, each sector being about the size of 2 US states, and, the data available for many areas of the world is not that detailed and overpriced for its use. Systems today can not render that detail and remain flyable anyway. Over time that will change and I am sure FS11 will become a much more defined world. FSX can do it now but the hardware can't and the cost to produce the detail is outrageous.
UTX doesd not change any moving boat traffic although if it defines a port where one is not by FSX default it may put a static set of boats in dock.
Also, the ground textures in the images above are GEX, the trees are Trees V2.1. I do not have any images of the default textures to compare right now