Incra products are what they are. Some love them, some hate them and others are in-between.
I have the Incra LS Supersystem as my router table fence but then I wanted a large RT cabinet (28"x52") to hold 2 routers and 15 drawers for storage. When I *add* a second table, it will likely be smaller but it will not displace the first. The Incra fence is a highly convenient, easy to use, accurage, highly repeatable fence system provided with and designed to accept Incra and user-made attachments, nothing more and nothing less.
I have the Incra/Jessem Mast-R-Lift holding one of those routers. It is an easy to use, highly accurate and repeatable router lift with a great deal of travel. I have most of a dozen magna-lock rings with different sized center holes to permit material support right up to the bit no matter what size bit I use. The rings are held in place very securely with rare earth magnets, which I really like.
I have several of the Incra rules.. straight, Tee and bent. I find those *really* convenient and dead n*ts accurate for marking.
I have an Incra miter gauge for my table saw. Like the fence it is highly accurate and repeatable.
Is there anything I've done that couldn't be done without them? Technically no although some of the things that were really easy with these tools would have been challenging without.
I guess it depends upon what makes woodworking fun for you. For some it is demonstrating they can overcome adversity doing projects such as carving Mt. Rushmore with an ice pick and a bent teaspoon. Others enjoy using fine tools to easily accomplish the same result. I fall in the latter category.
This post is kind of tongue-in-cheek because I made everything sound "black and white" while there's actually a large range of "gray" in between.