Lightroom is easy to use (Photoshop does have more of a learning curve) and is a lot more than just an organizer. The editing tools in LR are quite powerful and are plenty for 90% of photographers. If you want to more advanced stacking, tone mapping, etc then Photoshop might be more appropriate, but LR is an excellent editing program.
@ Bob, this is getting a bit off topic but Sony is about 10 years ahead of Nikon and Canon in the stills camera department. Nikon and Canon is still the choice for wedding and sports and is still perhaps more "mainstream" and well known in the US, but the same "best in the industry" 36mp sensor in the Nikon D800e (made by sony) is available in a Sony mirrorless body for less than half the weight, half the price, and a lot less bulk. Add curved sensor technology coming out this year, etc and Canon and Nikon have a lot of catching up to do in the innovation dept.
Also, ACR is an excellent RAW developer. The only place where manufacturers' RAW developers are really necessary are for sensors that are different than the typical Bayer (Foveon, Fuji X-Trans in the beginning).
edit: Jennifer, what you're describing is HDR (combining multiple exposures). There are plugins for LR or you can do it in PS. Lightroom is available as a standalone program or you can do Adobe's Creative Cloud, which is a subscription for $10/month and you get PS and LR (plus other Adobe software)