I file and fly IFR on every cross country, which is >90% of my flying. It works great. You can file any route you want and chances are you'll end up on a direct routing IF you are properly equipped (and I am going to assume so for this discussion). The route listed in a clearance is not necessarily entirely what you will fly. But it is where they expect you to go if comm is lost, and that is perhaps the biggest point.
I file, and my clearance in big cities almost always includes, DPs and STARs when they are available. I will usually start on a DP and may stay on the DP until I get switched to Center. Once I get handed to Center they very very *very* often clear me direct to either my destination airport or to the first fix on the STAR I filed for my destination. I seldom finish the entire DP before getting a "Cleared direct..."
I like IFR because it accomplishes all the stuff you would do VFR to get flight following anyway... plus way more. ATC is there for IFR traffic. Period. They are paying full attention to me. Does that mean more hassle in some cases? Seldom. I've flown IFR (in VMC) through active MOAs, for example. The old wisdom was that IFR traffic would almost always have to go around. Sometimes I do. Minor inconvenience.
I like IFR for busy or unfamiliar airspace. Especially DFW and Houston in my case. I will be in the B until they descend me to my destination and I will be receiving traffic alerts. So I stay out of the Cessna swarm below the B as long as possible. VFR I might get that, might not. IFR I nearly always do. I get vectors to my destination or to an approach. Super handy in unfamiliar airspace.
I like IFR least of all for flying in weather, although I use it for that too. It's just that out west the weather is seemingly a binary: 1 = certain death or 0 = 1000 mile visibility.
. But sometimes I need to enter clouds or bust through a layer or whatever. There have been trips where I see nothing but cloud layers above and below for hundreds of miles. There have been many trips I would have cancelled or delayed due to lame but tame weather were it not for the availability of IFR.
Some people don't like to be told what to do and see IFR as the ultimate example of that. But it isn't. I tell ATC what I want to do and how I propose to do it. They let me do what I want to do unless there is a reason not to. But what I almost always want to do is get from A to B efficiently. It's not about low flying and sight seeing. For that there is still VFR. And VFR rules in the mountains.
I flew 100% of my instrument training with an instructor and 95% of it was in the airplane. I passed my check ride after 40.0 hours of training. Did I save money? No idea. Maybe not if I'd had a ready supply of safety pilots willing to fly with me on my schedule and at the drop of a hat. But such pilots weren't available to me. But I certainly didn't waste any flight time the way I did it.