I felt the same way about our Pope Emeritus' middle volume of
Jesus of Nazareth. Very heavy going. Very worthwhile, but very heavy going. The other two volumes were a much easier read (of course they covered less ground and less complex ground).
But I did the same thing - read a couple of pages, and then put it down and thought about it awhile.
I can't help wondering if it's partly the translation though.
I haven't read it yet. I am reading a short book, but very sacramental
7 Secrets of the Eucharist by Vinny Flynn.
In my estimation it belongs in every Adoration Chapel. He quotes a lot from St. Faustina and from the CCC.