A little bit yeah.
As you rightly point out, none of them actually recline to the full 180 degrees flat. Only car carrycots do this, and they generally have to be placed sideways in the car which is a pain and it's likely that a sideways seat does not provide as good crash protection.
Any normal car seat, provided it is not from 1980 or one of the most basic, cheap, bare-bones ones which come with some of the cheaper travel systems, will have some kind of insert to flatten out the seat for younger babies. Granted, some work better than others. All infant type car seats, even the very basic and even old fashioned ones, have a reclined position - something between 30-40 degrees is typical.
Keeping them in their seat for up to 2 hours is not an issue (after the first 4 weeks or so, before this you should minimise car seat use where possible). You can take them out after the 2 hours and then they can go back in for another 2 hours etc, e.g. if you have a long journey. I would not recommend doing this every day.
Car seats are designed primarily for crash protection, so they are snug. They have to be snug to do that job. That means they can't give babies the freedom of movement that they have in things like a flat carrycot/bassinet, or a lie flat pushchair seat. If you're likely to have the baby in the pushchair for any length of time, it is much better for them to be in one of these seats rather than the car seat. OTOH if you're going to nip into the post office or to do the school run for another child, or some other shorter trip, it's not a problem for them to be in a car seat which has a semi-reclined position (e.g. 30-40 degree angle) for that short stretch of time.
The ones which recline or lie flat do go flatter than this - somewhere between 10-20 degrees usually. It is a nicer position for babies. If you are in a situation where you are likely to use the car seat a lot more than average, for example you do a lot of driving, or you travel often and it's easier to travel with than the main pram seat, or you are a non-driver and take a lot of taxis/combine public transport and lifts frequently, then it might be worth opting for it, simply because it does look more comfortable than the squished up position that a standard car seat has. And in those cases, you want the Cybex for sure because it is the largest/longest-lasting.
The other benefit is that if you have very sloping seats in your car, the recline can be one way to help counteract that slope and prevent the baby's head from flopping forward, which can happen sometimes with a standard infant car seat and sloping rear seats. (There are other solutions to this e.g. a base which has an opposite tilt).
But whether it's worth the £300 or so extra that those car seats (plus base) cost compared to a standard one? Honestly, I don't know that it is for most people. Especially when most people switch to a bigger car seat before the end of the first year. I think the benefits are overhyped. There is enough of a recline in standard infant car seats to cover your everyday use scenarios, remembering that car seats should not be used as a replacement for a bed/cot. It's OK to let them finish a nap which started in the car, provided they aren't pushing the 2 hour total limit.
If you have the money to spend, and you want total luxury for your baby then go for it. But don't be conned into thinking it's a must have - it's an optional extra, and generally a very expensive one (probably because the techical implications of getting it to pass crash testing with a hinge in it must be very difficult).