@jdaprile18 noted that they are getting consistent or higher than 60fps (which I assumed is their current monitor's refresh rate). Why the No? The information I relayed is relevant. Unless you're referring to the OP's question about 144 vs 240Hz. On that point I would wholeheartedly agree with a "No."
Caveat: If I am consistently getting higher than 60fps in games, I may benefit from a higher refresh rate monitor.
The no wasn't in relation to anything you said.
It was in relation to the OP's original question:
My Question is 2 parts; 1: can anyone with a 144 or 240 hz monitor lmk if it really does feel smoother
Along with the statement about playing at 60fps.
While the OP could have said 60fps simply in regards to syncing on a 60hz monitor, the OP hadn't specified anything about their average full frame rate in games without syncing turned on.
So I had to approach the question directly and specify for the OP that having a higher refresh rate monitor won't do anything for you in terms of smoothness if the frame rate isn't also higher to match.
Even in in the case of a 144Hz monitor and playing games at 100fps, that would be smoother, but in general having a higher refresh rate monitor doesn't make thing smoother when upgrading from a 60hz monitor if you are still playing at an average of 50-70fps in games.
So therefore I went on in my post to explain how it works and specify things for the OP so that they understood in full that higher refresh rate, while it can be smoother, will only be smoother if you also are getting frame rates that take advantage of the higher refresh rate.
You might be surprised by how many people I've come across in this forum alone that posted a question asking why things don't look or feel better/smoother after upgrading to a high refresh rate monitor, and it turned out that they were still playing at around 60fps in their games, and they were under the assumption that a higher refresh rate monitor in general just makes things smoother regardless of frame rates and that simply is not the case, and I overall blame tech news guys on YouTube and the tech industry as a whole for not properly explaining these things to the customers and just only talking about how higher refresh rate just feels so much better but they assume that the individual watching/reading already understands that you need higher frame rates to match for it to be effective.
So as a precaution I elaborated on the technology and how refresh rate and frame rate go hand in hand and also elaborated a tiny bit on how adaptive sync technology alters this a bit when thrown into the mix.
And yes, the OP did say 60fps "or higher" but they didn't really specify how much "higher" so I have to assume not enough to warrant worthwhile results when switching up to a 144hz panel from a 60hz one.