Headphones and speakers are very different experiences. Headphones do not have a soundstage perse and string the instruments along a clothesline stretched between your ears. But once you get used to it, you learn what this means. One also needs to accept that headphones have even more coloration than speakers, you buy the sound you like.
There are methods to mix some of one channel into the other, add feedback and otherwise manipulate the incoming signal to more replicate the speaker experience, but I find most of these offputting and more of an annoyance than a benefit. Headroom’s means for accomplishing this I find particularly dreadful. Michael Grace’s crossfeed is a good deal better.
Headphones are great for listening for minute details if you are into this sort of thing. I like them for editing.
I have a multip0le pairs of excellent headphones and almost as many excellent headphone amps. They are a hoot to play with. But they are yet one more step further removed from an actual performance.
As Ted mentions, it is well worth getting a demo of some truly good headphones and a dedicated headphone amp. It is another fun way to listen.