You should be able to maintain a conversation when in Zone 2. It's described as Easy/Steady rather than just Easy and it does require a little concentration to maintain. For some people, Zone 2 may require walking occasionally, interspersed with running.
There are numerous benefits to training in this zone - not all training needs to feel super hard. "No pain, no gain" is a myth.
If a zone feels too hard, it usually means it's not quite right. In this case Rate of Perceived Exertion is the best intensity measure until you get a better handle on your pace/HR zones. If you look at this table, you can use the columns called Hellemans or RPE to train by Rate of Perceived Exertion.
Zone 2 can also feel too easy for some people, especially when they're used to training at high intensities all the time. In this example, it might take some time to get used to but keep the faith.
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