I have been using LR4 now for two months and this is my first time using LR I previously just used PS ELE/CS. So far my experience has been that it's great for tagging, sorting and previewing previous to shipping off to PS. I also found it had adequate touch up power for minor editing and had a simple but not the best workflow layout.
Pros: Great for minor editing sorting and touchups for any recreational photographer or learning the basic's. Pretty powerful engine for quick workflow and editing ( see cons ) . Bonus is being an adobe product works very well in unison with other adobe programs.
Cons: As stated above the program runs a powerful engine but requires alot of CPU/GPU power to feed it, if you have not upgraded or bought a solid computer in the last two years this is probably not the choice for you. As someone else mentioned in another comment yes adobe LR is a "sandbox" program to some extent and is limited in creativity expression and you will have to use PS for.
Good photo with an even better landscape. would love to visit someday!