The 150s that came in were overcrowded, the 156s and 158s after them were overcrowded, the 185s are overcrowded. The route has been a history in how small fixed-formation trains can't cope with peak demands.
An hourly 47 was replaced with more frequent 150s, sure. But the peak travelling times haven't changed and can't change. The 185s weren't big enough when they were bought, and then they were spread too thinly thanks to the incompetence of DfT and the SRA.
The majority of capacity problems are on such flows as Huddersfield to Leeds in the morning and return in the evening. Myself I have no issue standing for 18 minutes to get home. If you want a train service where no one stands up to travel to or from work then carry on dreaming.
Going back through history, when the class 158s were about we had 3 trains per hour from Leeds to Manchester, then it was changed to 4 per hour, the additional one being usually from platform 17 at Leeds (or any west facing bay) and called at Huddersfield and Manchester Picc only.
The 185s arrived and replaced some 2 car trains with 3 cars, as well as some 3 car trains with 3 cars. Demand rose and some trains became 4 cars with class 170's or 6 cars with 185's. Class 350's arrived and TPE were able to run a 5th train per hour but to Man Vic. The 6th train per hour comes this year but with skip stops.
Trains on the route are faster than those operated when the 158s were about, that is a certainty. The main dramas on the route are TPE trains being held up by slow moving Northern units. All this changes over the next few years when Huddersfield to Mirfield is 4 tracked, plus other enhancements to the route between Leeds and Manchester happen.
People enjoy travelling on the current 5th train per hour to Man Vic - it is very well used and popular with the customers.
The primary issues are in the peaks mostly, where nearly everyone wants to travel on the same train at times, for example the 1709 from Leeds, the 1725 from Leeds and the 1740 from Leeds, all heading towards Huddersfield. No matter how many carriages you supply, the train will be full.
Try travelling down south in the peak and then complain about overcrowding on TPE.